Swelling: Clinical Meaning

Rheumatoid Arthritis

Rheumatoid arthritis (RA) is a chronic autoimmune disease that causes inflammation in the joints, leading to pain, swelling, and eventual joint damage. Unlike osteoarthritis, RA is systemic and can affect organs including the heart and lungs.

Osteoarthritis

Osteoarthritis is the most common form of arthritis, caused by the gradual breakdown of cartilage in joints. It primarily affects the knees, hips, hands, and spine, causing pain, stiffness, and reduced range of motion.

Gout

Gout is a form of inflammatory arthritis caused by elevated uric acid levels (hyperuricemia) that form crystals in joints. It causes sudden, severe attacks of pain, swelling, redness, and tenderness, most often in the big toe.

Heart Failure

Heart failure occurs when the heart cannot pump enough blood to meet the body's needs. It is a chronic condition that causes fatigue, shortness of breath, and fluid retention (edema). It requires ongoing medical management.

Liver Cirrhosis

Liver cirrhosis is advanced scarring (fibrosis) of the liver caused by long-term damage from hepatitis, alcohol abuse, or fatty liver disease. As scar tissue replaces healthy tissue, the liver loses its ability to function properly.

Atopic Dermatitis

Atopic dermatitis is a chronic inflammatory skin condition causing dry, itchy, and inflamed skin. It is most common in children but can occur at any age. It is part of the 'atopic triad' along with asthma and allergic rhinitis.

Eczema

Eczema is a group of conditions causing inflamed, itchy, cracked, and rough skin. Atopic eczema is the most common type. Triggers include soaps, detergents, stress, and environmental allergens. It is not contagious.

Bone Cancer (Osteosarcoma)

Osteosarcoma is the most common primary bone cancer, predominantly affecting adolescents. It presents as bone pain and swelling, most often around the knee; treatment involves surgery and chemotherapy.

Deep Vein Thrombosis (DVT)

Deep vein thrombosis is a blood clot forming in a deep vein, usually in the legs, causing swelling, pain, and redness. The greatest danger is pulmonary embolism if the clot breaks off and travels to the lungs.

Mitral Valve Disease

Mitral valve disease includes mitral regurgitation (valve leaking) and mitral stenosis (valve narrowing), causing symptoms of breathlessness, fatigue, and palpitations. Rheumatic heart disease is a major cause worldwide.

Cardiomyopathy

Cardiomyopathy is disease of the heart muscle that impairs its ability to pump blood effectively. Types include dilated (most common), hypertrophic, and restrictive; causes range from genetic mutations to chronic alcohol use.

Infectious Mononucleosis (Mono)

Infectious mononucleosis, caused by Epstein-Barr virus, presents with severe fatigue, sore throat, swollen lymph nodes, and splenomegaly. It primarily affects adolescents and young adults; strenuous activity must be avoided due to spleen rupture risk.

Cellulitis

Cellulitis is a bacterial skin infection causing redness, warmth, swelling, and tenderness of the skin and underlying tissue. Streptococcus and Staphylococcus are the most common causes; it requires prompt antibiotic treatment.

Osteomyelitis

Osteomyelitis is a bone infection caused by bacteria or fungi, causing localized bone pain, fever, and tenderness. Staphylococcus aureus is the most common causative organism; treatment requires prolonged antibiotics and sometimes surgery.

Antiphospholipid Syndrome

Antiphospholipid syndrome is an autoimmune disorder causing abnormal blood clotting, leading to deep vein thrombosis, pulmonary embolism, strokes, and recurrent miscarriages. Lifelong anticoagulation is the primary treatment.

Goodpasture Syndrome

Goodpasture syndrome is an autoimmune disease in which antibodies target the glomerular and alveolar basement membranes, causing rapidly progressive glomerulonephritis and pulmonary hemorrhage. Plasmapheresis and immunosuppression are urgent treatments.

Inguinal Hernia

An inguinal hernia occurs when tissue (usually part of the intestine) protrudes through a weak spot in the abdominal muscles, causing a groin bulge and discomfort. Surgical repair is recommended for symptomatic hernias.

Pulmonary Hypertension

Pulmonary hypertension is elevated pressure in the pulmonary arteries, causing progressive exertional dyspnea, syncope, and right heart failure. It is classified into five groups based on etiology; targeted therapies improve outcomes in pulmonary arterial hypertension.

Chronic Kidney Disease (CKD)

CKD is progressive, irreversible loss of kidney function over months to years, classified in stages 1-5 based on GFR. Diabetes and hypertension are the leading causes; management focuses on slowing progression and managing complications.

Acute Kidney Injury (AKI)

AKI is a sudden decrease in kidney function over hours to days, causing accumulation of waste products and fluid and electrolyte imbalances. Pre-renal (dehydration), intrinsic renal, and post-renal (obstruction) causes must be distinguished.

Glomerulonephritis

Glomerulonephritis is inflammation of the glomeruli causing hematuria, proteinuria, hypertension, and impaired kidney function. It can be acute (post-streptococcal) or chronic; IgA nephropathy is the most common form worldwide.

Nephrotic Syndrome

Nephrotic syndrome is characterized by massive proteinuria (>3.5g/day), hypoalbuminemia, edema, and hyperlipidemia. Causes include minimal change disease (children), membranous nephropathy, and diabetic nephropathy; steroids and immunosuppressants are used.

Contact Dermatitis

Contact dermatitis is skin inflammation caused by direct contact with an irritant (irritant contact dermatitis) or allergen (allergic contact dermatitis), causing redness, itching, and blistering. Common allergens include nickel, latex, and fragrances; avoidance and topical steroids are treatments.

Chronic Urticaria (Chronic Hives)

Chronic urticaria is characterized by recurrent hives lasting more than 6 weeks, causing intensely itchy wheals. In most cases no specific trigger is identified (chronic spontaneous urticaria); non-sedating antihistamines are first-line treatment.

Bursitis

Bursitis is inflammation of a bursa (fluid-filled sac cushioning bones and tendons), causing localized pain and swelling near joints. The shoulder, hip, elbow, and knee are commonly affected; rest, ice, and NSAIDs are initial treatments.

Tendinitis

Tendinitis is inflammation of a tendon, most commonly affecting the shoulder (rotator cuff), elbow (tennis/golfer's elbow), Achilles tendon, and patellar tendon. It causes localized pain worsening with activity; eccentric exercises and load management are key treatments.

Meniscus Tear

A meniscus tear is damage to the fibrocartilage of the knee, causing pain, swelling, stiffness, and clicking or locking. It commonly occurs during twisting injuries; treatment depends on tear type (conservative vs. surgical repair).

Preeclampsia

Preeclampsia is a pregnancy complication characterized by hypertension and proteinuria after 20 weeks gestation, potentially progressing to eclampsia (seizures) and multi-organ failure. Delivery is the definitive treatment; low-dose aspirin is preventive in high-risk women.

Mastitis

Mastitis is inflammation of the breast tissue, most commonly occurring during breastfeeding due to blocked milk ducts or bacterial infection (S. aureus). It causes breast pain, redness, warmth, and fever; antibiotics and continued breastfeeding are recommended.

Hereditary Angioedema

Hereditary angioedema is a rare genetic disorder causing recurrent episodes of severe swelling in the skin, GI tract, and airways due to C1-inhibitor deficiency. Laryngeal attacks can be fatal; specific treatments (icatibant, C1-INH concentrate) are available.

Pulmonary Edema

Pulmonary edema is excess fluid accumulation in the lungs making breathing difficult. Most cases result from heart problems, though non-cardiac causes also exist.

Psoriatic Arthritis

Psoriatic arthritis is inflammatory arthritis affecting some people with psoriasis. It causes joint pain, stiffness and swelling ranging from mild to severe with potential for joint damage.

Reactive Arthritis

Reactive arthritis is joint inflammation triggered by an infection elsewhere in the body, usually intestines, genitals, or urinary tract. The classic triad includes joint, eye, and urethral inflammation.

Anaphylaxis

Anaphylaxis is a severe, life-threatening allergic reaction requiring immediate emergency treatment with epinephrine. Common triggers include foods, insect stings, medications, and latex.

Food Allergy

Food allergies are immune system reactions that occur after eating a specific food. Even trace amounts can trigger signs and symptoms, including digestive problems, hives, or swollen airways.

Acute Urticaria (Hives)

Acute urticaria is a sudden-onset allergic skin reaction causing raised, itchy welts. It usually resolves within 6 weeks and can be triggered by foods, medications, infections, or insect bites.

Pulmonary Arterial Hypertension

Pulmonary arterial hypertension is high blood pressure in the arteries supplying the lungs. It causes the right side of the heart to work harder, eventually leading to heart failure.

Cardiac Tamponade

Cardiac tamponade is a life-threatening emergency where fluid accumulates in the pericardial sac, compressing the heart and impairing its ability to pump blood effectively.