Understanding Common Ailments: Cold & Flu Symptoms

Common Respiratory Illnesses: Symptom Comparison

Condition	Cause	Key Symptoms	Onset	Duration	Complications
Common Cold	Rhinovirus, coronavirus, RSV, others (200+ viruses)	Runny/stuffy nose, sore throat, sneezing, mild cough, low-grade fever	Gradual (1–3 days)	7–10 days	Sinusitis, otitis media, asthma exacerbation
Influenza (Flu)	Influenza A/B viruses	High fever (often), myalgias, headache, fatigue, dry cough, sore throat, chills	Abrupt (hours)	5–14 days; fatigue weeks	Pneumonia, myocarditis, encephalitis, worsening chronic disease
Acute Otitis Media	S. pneumoniae, H. influenzae, M. catarrhalis (post-viral)	Ear pain, fever, hearing loss, irritability (kids), otorrhea if perforated	Often post-URI	Days-weeks	Mastoiditis, hearing loss, tympanic membrane perforation
Sinusitis	Viral > bacterial; fungi (immunocompromised)	Facial pain/pressure, purulent discharge, nasal obstruction, hyposmia, headache, cough	Viral: <10 days; Bacterial: >10 days or worsening	Viral: 7–10d; Bacterial: weeks	Orbital/intracranial spread (rare)
Pharyngitis	Viral (most), GAS (15–30% kids, 5–10% adults)	Throat pain, odynophagia, fever, exudates, adenopathy (GAS); cough/rhinorrhea suggests viral	Abrupt (GAS)	3–7 days (viral); 3–5d treated (GAS)	Peritonsillar abscess, rheumatic fever (untreated GAS), post-strep glomerulonephritis

Red Flags for Medical Evaluation

• Difficulty breathing, chest pain
• Persistent fever >3 days or >102°F (39°C)
• Inability to swallow fluids, dehydration
• Symptoms >10 days without improvement
• Immunocompromised, chronic cardiopulmonary disease

Prevention

• Annual influenza vaccine
• COVID-19 boosters
• Hand hygiene, masking in high-risk settings
• Adequate sleep, nutrition, stress management

Most URIs are viral and self-limited. Antibiotics only for confirmed bacterial infection (GAS, bacterial sinusitis, otitis media with criteria).