Dilated cardiomyopathy develops insidiously, and may not initially cause symptoms significant enough to impact on quality of life. Nevertheless, many people experience significant symptoms. These might include:

- Shortness of breath

- Syncope (fainting)

- Angina, but only in the presence of ischemic heart disease

A person suffering from dilated cardiomyopathy may have an enlarged heart, with pulmonary edema and an elevated jugular venous pressure and a low pulse pressure. Signs of mitral and tricuspid regurgitation may be present.

The clinical course of HCM is variable. Many people with HCM are asymptomatic or mildly symptomatic, and many of those carrying disease genes for HCM do not have clinically detectable disease. The symptoms and signs of HCM include shortness of breath due to stiffening and decreased blood filling of the ventricles, exertional chest pain (sometimes known as angina) due to reduced blood flow to the coronary arteries, uncomfortable awareness of the heart beat (palpitations), as well as disruption of the electrical system running through the abnormal heart muscle, lightheadedness, weakness, fainting and sudden cardiac death.

Dyspnea is largely due to increased stiffness of the left ventricle (LV), which impairs filling of the ventricles, but also leads to elevated pressure in the left ventricle and left atrium, causing back pressure and interstitial congestion in the lungs. Symptoms are not closely related to the presence or severity of an outflow tract gradient. Often, symptoms mimic those of congestive heart failure (esp. activity intolerance and dyspnea), but treatment of each is different. Beta blockers are used in both cases, but treatment with diuretics, a mainstay of CHF treatment, will exacerbate symptoms in hypertrophic obstructive cardiomyopathy by decreasing ventricular preload volume and thereby increasing outflow resistance (less blood to push aside the thickened obstructing tissue).

Major risk factors for sudden death in individuals with HCM include prior history of cardiac arrest or ventricular fibrillation, spontaneous sustained ventricular tachycardia, family history of premature sudden death, unexplained syncope, LV thickness greater than or equal to 30 mm, abnormal exercise blood pressure and nonsustained ventricular tachycardia.

Symptoms of cardiomyopathies may include fatigue, swelling of the lower extremities and shortness of breath. Further indications of the condtion may include:

- Arrhythmia

- Fainting

- Diziness

Subjects' symptoms from non-compaction cardiomyopathy range widely. It is possible to be diagnosed with the condition, yet not to have any of the symptoms associated with heart disease. Likewise it possible to have severe heart failure, which even though the condition is present from birth, may only manifest itself later in life. Differences in symptoms between adults and children are also prevalent with adults more likely to have heart failure and children from depression of systolic function.

Common symptoms associated with a reduced pumping performance of the heart include:

- Breathlessness

- Fatigue

- Swelling of the ankles

- Limited physical capacity and exercise intolerance

Two conditions though that are more prevalent in noncompaction cardiomyopathy are: tachyarrhythmia which can lead to sudden cardiac death and clotting of the blood in the heart.

Dilated cardiomyopathy (DCM) is a condition in which the heart becomes enlarged and cannot pump blood effectively. Symptoms vary from none to feeling tired, leg swelling, and shortness of breath. It may also result in chest pain or fainting. Complications can include heart failure, heart valve disease, or an irregular heartbeat.

Causes include genetics, alcohol, cocaine, certain toxins, complications of pregnancy, and certain infections. Coronary artery disease and high blood pressure may play a role, but are not the primary cause. In many cases the cause remains unclear. It is a type of cardiomyopathy, a group of diseases that primarily affects the heart muscle. The diagnosis may be supported by an electrocardiogram, chest X-ray, or echocardiogram.

In those with heart failure treatment may include medications in the ACE inhibitor, beta blocker, and diuretic families. A low salt diet may also be helpful. In those with certain types of irregular heartbeat, blood thinners or an implantable cardioverter defibrillator may be recommended. If other measures are not effective a heart transplant may be an option in some.

About 1 per 2,500 people are affected. It occurs more frequently in men than women. Onset is most often in middle age. Five-year survival rate is about 50%. It can also occur in children and is the most common type of cardiomyopathy in this age group.

Untreated hearts with RCM often develop the following characteristics:

- M or W configuration in an invasive hemodynamic pressure tracing of the RA

- Square root sign of part of the invasive hemodynamic pressure tracing Of The LV

- Biatrial enlargement

- Thickened LV walls (with normal chamber size)

- Thickened RV free wall (with normal chamber size)

- Elevated right atrial pressure (>12mmHg),

- Moderate pulmonary hypertension,

- Normal systolic function,

- Poor diastolic function, typically Grade III - IV Diastolic heart failure.

Those afflicted with RCM will experience decreased exercise tolerance, fatigue, jugular venous distention, peripheral edema, and ascites. Arrhythmias and conduction blocks are common.

Boxer cardiomyopathy is an adult-onset disease with three distinct clinical presentations:

The concealed form is characterized by an asymptomatic dog with premature ventricular contractions (PVCs).

The overt form is characterized by ventricular tachyarrhythmias and syncope. Dogs with overt disease may also have episodic weakness and exercise intolerance, but syncope is the predominant manifestation.

The third form, which is recognized much less frequently, is characterized by myocardial systolic dysfunction. This may result in left-sided, right-sided, or bi-ventricular congestive heart failure. It is not known if this form represents a separate clinical entity, or whether it is part of the continuum of disease.

Cardiomyopathy is a group of diseases that affect the heart muscle. Early on there may be few or no symptoms. Some people may have shortness of breath, feel tired, or have swelling of the legs due to heart failure. An irregular heart beat may occur as well as fainting. Those affected are at an increased risk of sudden cardiac death.

Types of cardiomyopathy include hypertrophic cardiomyopathy, dilated cardiomyopathy, restrictive cardiomyopathy, arrhythmogenic right ventricular dysplasia, and takotsubo cardiomyopathy (broken heart syndrome). In hypertrophic cardiomyopathy the heart muscle enlarges and thickens. In dilated cardiomyopathy the ventricles enlarge and weaken. In restrictive cardiomyopathy the ventricle stiffens.

The cause is frequently unknown. Hypertrophic cardiomyopathy is often, and dilated cardiomyopathy in a third of cases is inherited from a person's parents. Dilated cardiomyopathy may also result from alcohol, heavy metals, coronary heart disease, cocaine use, and viral infections. Restrictive cardiomyopathy may be caused by amyloidosis, hemochromatosis, and some cancer treatments. Broken heart syndrome is caused by extreme emotional or physical stress.

Treatment depends on the type of cardiomyopathy and the degree of symptoms. Treatments may include lifestyle changes, medications, or surgery. In 2015 cardiomyopathy and myocarditis affected 2.5 million people. Hypertrophic cardiomyopathy affects about 1 in 500 people while dilated cardiomyopathy affects 1 in 2,500. They resulted in 354,000 deaths up from 294,000 in 1990. Arrhythmogenic right ventricular dysplasia is more common in young people.

Hypertrophic cardiomyopathy (HCM) is a condition in which a portion of the heart becomes thickened without an obvious cause. This results in the heart being less able to pump blood effectively. Symptoms vary from none to feeling tired, leg swelling, and shortness of breath. It may also result in chest pain or fainting. Complications include heart failure, an irregular heartbeat, and sudden cardiac death.

HCM is most commonly inherited from a person's parents. It is often due to mutations in certain genes involved with making heart muscle proteins. Other causes may include Fabry disease, Friedreich's ataxia, and certain medications such as tacrolimus. It is type of cardiomyopathy, a group of diseases that primarily affects the heart muscle. Diagnosis often involves an electrocardiogram, echocardiogram, and stress testing. Genetic testing may also be done.

Treatment may include the use of beta blockers, diuretics, or disopyramide. An implantable cardiac defibrillator may be recommended in those with certain types of irregular heartbeat. Surgery, in the form of a septal myectomy or heart transplant, may be done in those who do not improve with other measures. With treatment, the risk of death from the disease is less than one percent a year.

HCM affects about one in 500 people. Rates in men and women are about equal. People of all ages may be affected. The first modern description of the disease was by Donald Teare in 1958.

All dogs with Boxer cardiomyopathy are at risk of sudden cardiac death. This includes asymptomatic dogs, meaning that sudden death may be the first sign of disease.

Sudden cardiac death is usually caused by the degeneration of ventricular tachycardia to ventricular fibrillation. Unless terminated promptly by defibrillation, death usually occurs within minutes.

For many people cardiomegaly is asymptomatic. For others, if the enlarged heart begins to affect the body's ability to pump blood effectively, then symptoms associated with congestive heart failure may arise.

- Heart palpitations – irregular beating of the heart, usually associated with a valve issue inside the heart.

- Severe shortness of breath (especially when physically active) – irregularly unable to catch one's breath.

- Chest pain

- Fatigue

- Swelling in legs

- Increased abdominal girth

- Weight gain

- Edema – swelling

- Fainting

In a study (2006) carried out on 53 patients with the condition in Mexico, 42 had been diagnosed with another form of heart disease and only in the most recent 11 cases that ventricular noncompation was diagnosed and this took several echocardiograms to confirm. The most common misdiagnoses were:

- dilated cardiomyopathy: 30 Cases

- congenital heart disease: 6 Cases

- ischemic heart disease: 2 Cases

- disease of the heart valves: 2 Cases

- dilated phase hypertensive cardiomyopathy: 1 Case

- restrictive cardiomyopathy: 1 Case

The high number of misdiagnoses can be attributed to non-compaction cardiomyopathy being first reported in 1990; diagnosis is therefore often overlooked or delayed. Advances in medical imaging equipment have made it easier to diagnose the condition, particularly with the wider use of MRIs.

Restrictive cardiomyopathy (RCM) is a form of cardiomyopathy in which the walls of the heart are rigid (but not thickened). Thus the heart is restricted from stretching and filling with blood properly. It is the least common of the three original subtypes of cardiomyopathy: hypertrophic, dilated, and restrictive.

It should not be confused with constrictive pericarditis, a disease which presents similarly but is very different in treatment and prognosis.

Diastolic heart failure and diastolic dysfunction refer to the decline in performance of one (usually the left ventricle) or both (left and right) ventricles during diastole. Diastole is the cardiac cycle phase during which the heart is relaxing and filling with incoming blood that is being returned from the body through the inferior (IVC) and superior (SVC) venae cavae to the right atrium and from lungs through pulmonary veins to the left atrium. In diastolic failure, if the patient has symptoms, there is a pathologic cause inducing them. Diastolic dysfunction can be found when doing a Doppler echocardiography in an apparently healthy patient, mainly in an elderly person.

Signs and symptoms presented by the occurrence of alcoholic cardiomyopathy are the result of the heart failing and usually occur after the disease has progressed to an advanced stage. Therefore, the symptoms have a lot in common with other forms of cardiomyopathy. These symptoms can include the following:

- Ankle, feet, and leg swelling (edema)

- Overall swelling

- Loss of appetite

- Shortness of breath (dyspnea), especially with activity

- Breathing difficulty while lying down

- Fatigue, weakness, faintness

- Decreased alertness or concentration

- Cough containing mucus, or pink, frothy material

- Decreased urine output (oliguria)

- Need to urinate at night (nocturia)

- Heart palpitations (irregular heart beat)

- Rapid pulse (tachycardia)

Cardiomegaly is a condition affecting the cardiovascular system, specifically the heart. This condition is strongly associated with congestive heart failure. Within the heart, the working fibers of the myocardial tissue increase in size. As the heart works harder the actin and myosin filaments experience less overlap which increases the size of the myocardial fibers. If there is less overlap of the protein filaments actin and myosin within the sarcomeres of muscle fibers, they will not be able to effectively pull on one another. If the heart tissue (walls of left and right ventricle) gets too big and stretches too far, then those filaments cannot effectively pull on one another to shorten the muscle fibers, thus impacting the heart's sliding filament mechanism. If fibers cannot shorten properly, and the heart cannot contract properly, then blood cannot be effectively pumped to the lungs to be re-oxygenated and to the body to deliver oxygen to the working tissues of the body.

Ventricular hypertrophy (VH) is thickening of the walls of a ventricle (lower chamber) of the heart. Although left ventricular hypertrophy (LVH) is more common, right ventricular hypertrophy (RVH), as well as concurrent hypertrophy of both ventricles can also occur.

Ventricular hypertrophy can result from a variety of conditions, both adaptive and maladaptive. For example, it occurs in what is regarded as a physiologic, adaptive process in pregnancy in response to increased blood volume; but can also occur as a consequence of ventricular remodeling following a heart attack. Importantly, pathologic and physiologic remodeling engage different cellular pathways in the heart and result in different gross cardiac phenotypes.

Among the causes of LBBB are:

- Aortic stenosis

- Dilated cardiomyopathy

- Acute myocardial infarction

- Extensive coronary artery disease

- Primary disease of the cardiac electrical conduction system

- Long standing hypertension leading to aortic root dilatation and subsequent aortic regurgitation

- Lyme disease

- Side effect of some cardiac surgeries (e.g., aortic root reconstruction)

People with TIC most often present with symptoms of congestive heart failure and/or symptoms related to their irregular heart rhythm. Symptoms of congestive heart failure can include shortness of breath, ankle swelling, fatigue, and weight gain. Symptoms of an irregular heart rhythm can include palpitations and chest discomfort.

The timecourse of TIC is most well-studied in experiments on animals. Researchers have found that animals began to exhibit abnormal changes in blood flow after just one day of an artificially generated fast heart rate (designed to simulate a tachyarrythmia). As their TIC progresses, these animals will have worsening heart function (e.g.: reduced cardiac output and reduced ejection fraction) for 3–5 weeks. The worsened heart function then persists at a stable state until the heart rate is returned to normal. With normal heart rates, these animals begin to demonstrate improving heart function at 1–2 days, and even complete recovery of ejection fraction at 1 month.

Human studies of the timecourse of TIC are not as robust as animal studies, though current studies suggest that the majority of people with TIC will recover a significant degree of heart function over months to years.

Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.

In individuals with eccentric hypertrophy there may be little or no indication that hypertrophy has occurred as it is generally a healthy response to increased demands on the heart. Conversely, concentric hypertrophy can make itself known in a variety of ways. Most commonly, chest pain, either with or without exertion is present, along with shortness of breath with exertion, general fatigue, syncope, and palpitations. Overt signs of heart failure, such as edema, or shortness of breath without exertion are uncommon.

Symptoms usually include one or more of the following: orthopnea (difficulty breathing while lying flat), dyspnea (shortness of breath on exertion), pitting edema (swelling), cough, frequent night-time urination, excessive weight gain during the last month of pregnancy (1-2+ kg/week; two to four or more pounds per week), palpitations (sensation of racing heart-rate, skipping beats, long pauses between beats, or fluttering), and chest pain.

The shortness of breath is often described by PPCM patients as the inability to take a deep or full breath or to get enough air into the lungs. Also, patients often describe the need to prop themselves up overnight by using two or more pillows in order to breathe better. These symptoms, swelling, and/or cough may be indications of pulmonary edema (fluid in the lungs) resulting from acute heart failure and PPCM.

Unfortunately, patients and clinicians sometimes dismiss early symptoms because they appear to be typical of normal pregnancy. Yet, early detection and treatment are critically important to the patient with PPCM. Delays in diagnosis and treatment of PPCM are associated with increased morbidity and mortality.

It is important to note that occasionally patients present with other signs or symptoms. This is demonstrated by one report of a woman with liver failure five weeks postpartum who was being considered for liver transplant. An echocardiogram was performed and revealed PPCM and heart failure as the cause of her severe liver failure. Conventional heart failure medications were administered. She survived and completely recovered from both the liver failure and PPCM.

It is also quite common for women to present with evidence of having an embolus (clot) passing from the heart to a vital organ, causing such complications as stroke, loss of circulation to a limb, even coronary artery occlusion (blockage) with typical myocardial infarction (heart attack).

For these reasons, it is paramount that clinicians hold a high suspicion of PPCM in any peri- or postpartum patient where unusual or unexplained symptoms or presentations occur.

Abnormal heart sounds, murmurs, ECG abnormalities, and enlarged heart on chest x-ray may lead to the diagnosis. Echocardiogram abnormalities and cardiac catheterization or angiogram to rule out coronary artery blockages, along with a history of alcohol abuse can confirm the diagnosis.

Any condition or process that leads to stiffening of the left ventricle can lead to diastolic dysfunction. Causes of left ventricular stiffening include:

- A long-standing hypertension where, as a result of left ventricular muscle hypertrophy caused by the high pressure, the left ventricle has become stiff.

- Aortic stenosis of any cause where the ventricular muscle becomes hypertrophied, and thence stiff, as a result of the increased pressure load placed on it by the stenosis.

- Diabetes

- Age – elderly patients mainly if they have hypertension.

Causes of isolated right ventricular diastolic failure are uncommon. These causes include:

- Constrictive pericarditis

- Restrictive cardiomyopathy, which includes Amyloidosis (most common restrictive), Sarcoidosis and fibrosis.

Tachycardia-induced cardiomyopathy (TIC) is a disease where prolonged tachycardia (a fast heart rate) or arrhythmia (an irregular heart rhythm) cause an impairment of the myocardium (heart muscle), which can result in heart failure. People with TIC may have symptoms associated with heart failure (e.g. shortness of breath or ankle swelling) and/or symptoms related to the tachycardia or arrhythmia (e.g. palpitations). Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease.

There are no formal diagnostic criteria for TIC. Thus, TIC is typically diagnosed when (1) tests have excluded other causes of cardiomyopathy and (2) there is improvement in myocardial function after treatment of the tachycardia or arrhythmia. Treatment of TIC can involve treating the heart failure as well as the tachycardia or arrhythmia. TIC has a good prognosis with treatment, with most people recovering some to all of their heart function.

The number of cases that occur is unclear. TIC has been reported in all age groups.