The most common symptoms of salicylate sensitivity are:

- Stomach pain/upset stomach

- Tinnitus ringing of the ears

- Itchy skin, hives or rashes

- Asthma and other breathing difficulties

- Angioedema

- Headaches

- Swelling of hands, feet, eyelids, face and/or lips

- Bed wetting or urgency to pass water

- Persistent cough

- Changes in skin color/skin discoloration

- Fatigue

- Sore, itchy, puffy or burning eyes

- Sinusitis/Nasal polyps

- Diarrhea

- Nausea

- Hyperactivity

- Memory loss and poor concentration

- Depression

- Pseudoanaphylaxis

Salicylate sensitivity, also known as salicylate intolerance, is any adverse effect that occurs when a usual amount of salicylate is ingested. People with salicylate intolerance are unable to consume a normal amount of salicylate without adverse effects.

Salicylate sensitivity differs from salicylism, which occurs when an individual takes an overdose of salicylates. Salicylate overdose can occur in people without salicylate sensitivity, and can be deadly if untreated. For more information, see aspirin poisoning.

Salicylates are derivatives of salicylic acid that occur naturally in plants and serve as a natural immune hormone and preservative, protecting the plants against diseases, insects, fungi, and harmful bacteria. Salicylates can also be found in many medications, perfumes and preservatives. Both natural and synthetic salicylates can cause health problems in anyone when consumed in large doses. But for those who are salicylate intolerant, even small doses of salicylate can cause adverse reactions.

It is characterized by enlargement of the lymph nodes near the inner border of the lungs (called "hilar lymphadenopathy") as seen on x-ray, and tender red nodules (erythema nodosum) are classically present on the shins, predominantly in women. It may also be accompanied by arthritis (more prominent in men) and fever. The arthritis is often acute and involves the lower extremities.

Löfgren syndrome consists of the triad of erythema nodosum, bilateral hilar lymphadenopathy on chest radiograph, and arthralgia.

As ulcerative colitis is believed to have a systemic (i.e., autoimmune) origin, patients may present with comorbidities leading to symptoms and complications outside the colon. The frequency of such extraintestinal manifestations has been reported as anywhere between 6 and 47 percent, and include the following:

- Aphthous ulcer of the mouth

- Ophthalmic

- Iritis or uveitis, which is inflammation of the eye's iris

- Episcleritis

- Musculoskeletal:

- Seronegative arthritis, which can be a large-joint oligoarthritis (affecting one or two joints), or may affect many small joints of the hands and feet

- Ankylosing spondylitis, arthritis of the spine

- Sacroiliitis, arthritis of the lower spine

- Cutaneous (related to the skin):

- Erythema nodosum, which is a panniculitis, or inflammation of subcutaneous tissue involving the lower extremities

- Pyoderma gangrenosum, which is a painful ulcerating lesion involving the skin

- Deep venous thrombosis and pulmonary embolism

- Autoimmune hemolytic anemia

- Clubbing, a deformity of the ends of the fingers.

- Primary sclerosing cholangitis, a distinct disease that causes inflammation of the bile ducts

Patients will experience a hyperthyroid period as the cellular lining of colloid spaces fails, allowing abundant colloid into the circulation, with neck pain and fever. Patients typically then become hypothyroid as the pituitary reduces TSH production and the inappropriately released colloid is depleted before resolving to euthyroid. The symptoms are those of hyperthyroidism and hypothyroidism. In addition, patients may suffer from painful dysphagia. There are multi-nucleated giant cells on histology. Thyroid antibodies can be present in some cases. The clinical presentation during the hyperthyroid phase can mimic those of Diffuse Toxic Goiter or Graves' disease. In such cases, a radionuclide thyroid uptake and scan can be helpful, since subacute thyroiditis will result in decreased isotope uptake, while Graves' disease will generally result in increased uptake. Distinguishing between these two types of disease is important, since Graves' disease and Diffuse Toxic Goiter can be treated with radioiodine therapy, but subacute thyroiditis is usually self-limited and is not treated with radioiodine.

De Quervain's thyroiditis, also known as subacute granulomatous thyroiditis or giant cell thyroiditis. People of all ages and genders may be affected. It is a member of the group of thyroiditis conditions known as resolving thyroiditis.

In addition to the extent of involvement, people may also be characterized by the severity of their disease.

- "Mild disease" correlates with fewer than four stools daily, with or without blood, no systemic signs of toxicity, and a normal erythrocyte sedimentation rate (ESR) or C-reactive protein (CRP). Mild abdominal pain or cramping may occur. Patients may believe they are constipated when in fact they are experiencing tenesmus, which is a constant feeling of the need to empty the bowel accompanied by involuntary straining efforts, pain, and cramping with little or no fecal output. Rectal pain is uncommon.

- "Moderate disease" correlates with more than four stools daily, but with minimal signs of toxicity. Patients may display anemia (not requiring transfusions), moderate abdominal pain, and low grade fever, .

- "Severe disease", correlates with more than six bloody stools a day or observable massive and significant bloody bowel movement, and evidence of toxicity as demonstrated by fever, tachycardia, anemia or an elevated ESR or CRP.

- "Fulminant disease" correlates with more than ten bowel movements daily, continuous bleeding, toxicity, abdominal tenderness and distension, blood transfusion requirement and colonic dilation (expansion). Patients in this category may have inflammation extending beyond just the mucosal layer, causing impaired colonic motility and leading to toxic megacolon. If the serous membrane is involved, a colonic perforation may ensue. Unless treated, the fulminant disease will soon lead to death.

Gonococcemia (also known as "Arthritis–dermatosis syndrome" and "Disseminated gonococcal infection") is a condition characterized by a hemorrhagic vesiculopustular eruption, bouts of fever, and arthralgia or actual arthritis of one or several joints.

It's characterized by a triad of symptoms: migratory polyarthritis, tenosynovitis, and dermatitis (pustular skin lesions).

Reactive arthritis, also known as Reiter's syndrome, is a form of inflammatory arthritis that develops in response to an infection in another part of the body (cross-reactivity). Coming into contact with bacteria and developing an infection can trigger the disease. By the time the patient presents with symptoms, often the "trigger" infection has been cured or is in remission in chronic cases, thus making determination of the initial cause difficult.

The arthritis often is coupled with other characteristic symptoms; this has been called Reiter's syndrome, Reiter's disease or Reiter's arthritis. The term "reactive arthritis" is increasingly used as a substitute for this designation because of Hans Conrad Julius Reiter's war crimes with the Nazi Party. The manifestations of reactive arthritis include the following triad of symptoms: an inflammatory arthritis of large joints, inflammation of the eyes in the form of conjunctivitis or uveitis, and urethritis in men or cervicitis in women. Arthritis occurring alone following sexual exposure or enteric infection is also known as reactive arthritis. Patients can also present with mucocutaneous lesions, as well as psoriasis-like skin lesions such as circinate balanitis, and keratoderma blennorrhagicum. Enthesitis can involve the Achilles tendon resulting in heel pain. Not all affected persons have all the manifestations.

The clinical pattern of reactive arthritis commonly consists of an inflammation of fewer than five joints which often includes the knee or sacroiliac joint. The arthritis may be "additive" (more joints become inflamed in addition to the primarily affected one) or "migratory" (new joints become inflamed after the initially inflamed site has already improved).

Reactive arthritis is an RF-seronegative, HLA-B27-linked arthritis often precipitated by genitourinary or gastrointestinal infections. The most common triggers are intestinal infections (with "Salmonella", "Shigella" or "Campylobacter") and sexually transmitted infections (with "Chlamydia trachomatis").

It most commonly strikes individuals aged 20–40 years of age, is more common in men than in women, and more common in white than in black people. This is owing to the high frequency of the HLA-B27 gene in the white population. It can occur in epidemic form. Patients with HIV have an increased risk of developing reactive arthritis as well.

A large number of cases during World Wars I and II focused attention on the triad of arthritis, urethritis, and conjunctivitis (often with additional mucocutaneous lesions), which at that time was also referred to as Fiessenger-Leroy-Reiter syndrome.

Löfgren syndrome is a type of acute sarcoidosis that is frequent in Scandinavian, Irish, African and Puerto Rican women. It was described in 1953 by Sven Halvar Löfgren, a Swedish clinician. Some have considered the condition to be imprecisely defined.

Meltzer’s triad describes the classical symptoms suggesting the diagnosis of cryoglobulinaemia of polyclonal CGs seen in essential-, viral-, or connective tissue disease-associated cryoglobulinaemia. The triad consists of:

- palpable purpura

- arthralgia (joint pain)

- weakness.

Reactive arthritis may be self-limiting, frequently recurring, chronic or progressive. Most patients have severe symptoms lasting a few weeks to six months. 15 to 50 percent of cases involve recurrent bouts of arthritis. Chronic arthritis or sacroiliitis occurs in 15–30 percent of cases. Repeated attacks over many years are common, and patients sometimes end up with chronic and disabling arthritis, heart disease, amyloid deposits, ankylosing spondylitis, immunoglobulin A nephropathy, cardiac conduction abnormalities, or aortitis with aortic regurgitation. However, most people with reactive arthritis can expect to live normal life spans and maintain a near-normal lifestyle with modest adaptations to protect the involved organs.

Grinspan syndrome is a syndrome characterized by presence of the triad: essential hypertension, diabetes mellitus, and oral lichen planus.

Oral lichen planus is thought to be a result of the drugs used for treatment of hypertension and diabetes mellitus but this is not confirmed.

The symptomatic patient may present with dyspnea, cyanosis, chest pain, pulsus paradoxus, bradycardia or tachycardia. On physical examination, the patient may have the classic “Beck’s triad” – hypotension, raised JVP and distant heart sounds, when complicated by cardiac tamponade. Extension of the mediastinal air to the subcutaneous tissues via the fascial planes may lead to subcutaneous emphysema. When air and fluid mix together in the pericardial sac, a tinkling sound superimposed over a succussion splash is heard. This is known as a “Bruit de Moulin”, which is French for “Mill–wheel” murmur. Air between the anterior parietal pericardium and the thoracic cage may also give rise to the “Hamman’s Sign” – which is a crunching sound typically heard on auscultation of the chest, but may sometimes be heard even with the unaided ear.

Hand–Schüller–Christian disease is associated with multifocal Langerhans cell histiocytosis.

It is associated with a triad of exophthalmos, lytic bone lesions (often in the skull), and diabetes insipidus (from pituitary stalk infiltration).

It is named for the US-American pediatrician Alfred Hand Jr, the Austrian neurologist and radiologist Arthur Schüller, and the US-American internist Henry Asbury Christian, who described it in 1893, 1915/16 and 1919

Reye syndrome progresses through five stages:

- Stage I

- Rash on palms of hands and feet

- Persistent, heavy vomiting that is not relieved by not eating

- Generalized lethargy

- Confusion

- Nightmares

- No fever usually present

- Headaches

- Stage II

- Stupor

- Hyperventilation

- Fatty liver (found by biopsy)

- Hyperactive reflexes

- Stage III

- Continuation of Stage I and II symptoms

- Possible coma

- Possible cerebral edema

- Rarely, respiratory arrest

- Stage IV

- Deepening coma

- Dilated pupils with minimal response to light

- Minimal but still present liver dysfunction

- Stage V

- Very rapid onset following stage IV

- Deep coma

- Seizures

- Multiple organ failure

- Flaccidity

- Hyperammonemia (above 300 mg/dL of blood)

- Death

Other symptoms of the syndrome include:

- retroorbital pain due to pain in the area supplied by the ophthalmic branch of the trigeminal nerve (fifth cranial nerve),

- abducens nerve palsy (sixth cranial nerve), and

- otitis media.

Other symptoms can include photophobia, excessive lacrimation, fever, and reduced corneal sensitivity.

The syndrome is usually caused by the spread of an infection into the petrous apex of the temporal bone.

Pneumopericardium is a medical condition where air enters the pericardial cavity. This condition has been recognized in preterm neonates, in which it is associated with severe lung pathology, after vigorous resuscitation, or in the presence of assisted ventilation. This is a serious complication, which if untreated may lead to cardiac tamponade and death. Pneumomediastinum, which is the presence of air in the mediastinum, may mimic and also coexist with pneumopericardium.

It can be congenital, or introduced by a wound.

Hutchinson's teeth (also known as Hutchinson's incisor, Hutchinson's sign or Hutchinson-Boeck teeth) are a sign of congenital syphilis. Babies with this have teeth that are smaller and more widely spaced than normal and which have notches on their biting surfaces. It is named after Sir Jonathan Hutchinson, an English surgeon and pathologist, who first described them.

Hutchinson's teeth form part of Hutchinson's triad.

Causes for similar symptoms include

- Various inborn metabolic disorders

- Viral encephalitis

- Drug overdose or poisoning

- Head trauma

- Liver failure due to other causes

- Meningitis

- Kidney failure

- Shaken baby syndrome

Patients with MALS reportedly experience abdominal pain, particularly in the epigastrium, which may be associated with eating and which may result in anorexia and weight loss.The pain can be in the left or right side, but usually where the ribs meet. Other signs are persistent nausea, lassitude (especially after a heavy meal) and exercise intolerance. Diarrhea is a common symptom, some experience constipation. While some experience vomiting, not everyone does. Exercise or certain postures can aggravate the symptoms. Occasionally, physical examination reveals an abdominal bruit in the mid-epigastrium.

Complications of MALS result from chronic compression of the celiac artery. They include gastroparesis and aneurysm of the pancreaticoduodenal arteries.

Ductopenia refers to a reduction in the number of ducts in an organ. It is the histological hallmark of vanishing bile duct syndrome (typically <0.5 bile ducts per portal triad). The most common cause of ductopenia is primary biliary cholangitis.

Other causes of ductopenia include failing liver transplant, Hodgkin's lymphoma, graft-versus-host disease (GVHD), sarcoid, Cytomegalovirus infection, HIV and medication toxicity.

The cause of HS remains unknown and experts disagree over proposed causes. The condition probably results from a combination of genetic and environmental factors.

Lesions occur in any body areas with hair follicles, although areas such as the axilla, groin, and perianal region are more commonly involved. This theory includes most of the following potential indicators:

- Postpubescent individuals are more likely to exhibit HS.

- Plugged apocrine (sweat) gland or hair follicle

- Excessive sweating

- Androgen dysfunction

- Genetic disorders that alter cell structure

- Patients with more advanced cases may find exercise intolerably painful, which may increase the rate of obesity among sufferers.

The historical understanding of the disease suggests dysfunctional apocrine glands or dysfunctional hair follicles, possibly triggered by a blocked gland, create inflammation, pain, and a swollen lesion.

Hutchinson's triad is named after Sir Jonathan Hutchinson (1828–1913). It is a common pattern of presentation for congenital syphilis, and consists of three phenomena: interstitial keratitis, malformed teeth (Hutchinson incisors and mulberry molars), and eighth nerve deafness.

Postoperative cognitive dysfunction (POCD) is a decline in cognitive function (especially in memory and executive functions) that may last from a few days to a few weeks after surgery. In rare cases, this disorder may persist for several months after major surgery. POCD is distinct from emergence delirium. It occurs most commonly in older patients and those with pre-existing cognitive impairment.

The causes of POCD are not understood. It does not appear to be caused by lack of oxygen or impaired blood flow to the brain and is equally likely under regional and general anesthesia. It may be mediated by the body's inflammatory response to surgery.