Types of Cough: Clinical Classification, Causes, and When to Seek Care

Cough is a protective reflex clearing airways. Characterizing it by quality, duration, and associated features narrows the differential and guides urgency.

By Duration

• Acute: <3 weeks (usually infectious—URI, bronchitis, flu, COVID, pneumonia).
• Subacute: 3–8 weeks (post-infectious, pertussis, resolving pneumonia).
• Chronic: >8 weeks adults, >4 weeks children (see persistent cough article).

By Character (Quality)

Type	Description	Common Causes	Key Features
Wet / Productive	Produces mucus/sputum	Bronchitis, pneumonia, bronchiectasis, COPD, CF, TB	Color: clear/white (viral), yellow/green (bacterial/eosinophilic), bloody (TB, cancer, PE), frothy pink (pulmonary edema)
Dry / Non-Productive	No sputum; tickly, hacking	Viral URI, asthma, GERD, ACEi, interstitial lung disease, early pneumonia, heart failure	Often worse at night, with talking, cold air
Whooping (Paroxysmal)	Staccato coughs → inspiratory "whoop" / post-tussive emesis	Pertussis (B. pertussis), parapertussis, adenovirus	Apnea in infants; adolescents/adults may lack whoop
Barking / Croupy	Seal-like bark, inspiratory stridor	Croup (parainfluenza), spasmodic croup, foreign body	Age 6 mo–3 yr; worse at night; dexamethasone + nebulized epinephrine if stridor at rest
Asthmatic	Dry, hacking, often with wheeze, chest tightness, dyspnea	Asthma (cough-variant = cough only)	Diurnal variation; trigger-induced; responds to bronchodilator/ICS
Honking / Habit	Loud, repetitive, no distress	Somatic cough syndrome (psychogenic)	Absent during sleep; distractible; pediatric/adolescent

By Timing/Trigger

• Nocturnal: Asthma, GERD/LPR, heart failure, post-nasal drip (supine).
• Post-prandial: GERD, aspiration, food allergy.
• Exercise-induced: EIB (asthma), VCD (vocal cord dysfunction).
• Positional: GERD (lying flat), heart failure (orthopnea).

When to See a Doctor — Urgent/Red Flags

• Hemoptysis (any amount if >40/smoker; >1 tsp any age).
• Dyspnea, stridor, respiratory distress.
• Fever >102°F (39°C) >3 days, or any fever in infant <3 mo.
• Weight loss, night sweats, hoarseness >3 wks.
• Chest pain (pleuritic or crushing).
• Syncope with cough (cough syncope).
• Immunocompromised, recent TB exposure, high-risk travel.

When to See a Doctor — Routine

• Cough >3 weeks (adults) / >2 weeks (children).
• Cough interfering with sleep, work, school.
• Worsening or changing character.
• Known asthma/COPD with increased symptoms.

Cough is a language. Learning its dialects—wet, dry, barking, whooping, nocturnal—transforms a nuisance into a diagnostic clue.