Common Symptoms of Illness: When to See a Doctor

Many diseases share nonspecific symptoms. Common clusters:

Constitutional

• Fever, chills, night sweats.
• Fatigue, malaise, unexplained weight loss.

Respiratory

• Cough (dry/productive), dyspnea, hemoptysis, wheeze.

Gastrointestinal

• Nausea, vomiting, diarrhea, constipation.
• Abdominal pain, bloating, melena/hematochezia.
• Dysphagia, odynophagia.

Neurologic

• Headache, dizziness, syncope.
• Weakness, numbness, tingling, confusion.
• Seizure, vision changes.

Musculoskeletal

• Myalgias, arthralgias, joint swelling.

Dermatologic

• Rash, pruritus, jaundice, pallor, cyanosis.

Urologic

• Dysuria, frequency, urgency, hematuria, flank pain.

Red Flags for Urgent Evaluation

• Chest pain, severe dyspnea, syncope.
• Focal neurologic deficits (stroke signs).
• Uncontrolled bleeding, severe pain.
• High fever >103°F (39.4°C) or fever in immunocompromised.
• Signs of dehydration, shock.

This list is not diagnostic. Persistent or worsening symptoms always warrant professional assessment.