Common Disease Symptoms by System: A Clinical Reference

Symptoms cluster by organ system but overlap significantly. This guide highlights typical presentations.

Infectious

Fever, chills, fatigue, myalgia, headache, cough, sore throat, rhinorrhea, diarrhea, vomiting.

Respiratory

Dyspnea, chest pain, wheeze, cough, sputum, hemoptysis, orthopnea.

Cardiovascular

Chest pain (angina/MI), dyspnea, palpitations, syncope, edema, claudication.

Neurological

Headache, seizure, weakness, numbness, dysarthria, dysphagia, vision changes, ataxia, cognitive decline.

Gastrointestinal

Abdominal pain, nausea/vomiting, diarrhea, constipation, hematochezia/melena, dysphagia, heartburn, jaundice.

Musculoskeletal

Joint pain/swelling/stiffness, myalgia, back/neck pain, limited ROM, deformity.

Dermatologic

Rash, pruritus, vesicles, bullae, ulcer, alopecia, nail changes, color changes.

Endocrine

Polyuria/polydipsia, weight change, fatigue, temperature intolerance, menstrual irregularity, libido change.

Oncologic

Unexplained weight loss, persistent pain, mass, bleeding, obstruction, paraneoplastic syndromes.

Psychiatric

Depressed mood, anhedonia, anxiety, psychosis, insomnia, cognitive impairment, suicidality.

Critical Principle

Symptoms are nonspecific; diagnosis requires history, exam, targeted testing, and clinical reasoning. Never self-diagnose; consult a clinician for persistent or alarming symptoms.