Salam Alikum doctor

Dear customers, Evaluating the answer from the top of the page after reading it helps us improve the quality of answers and ensure that the best experts are available to help you
CAUSES:
- ALLERGIES
-asthma
- viral infection of the upper inspiratory infection
- tuberculosis
- influenza
- bronchitis
- sinusitis
- tonisilitis
- whooping cough
- laryngitis
- smoke
TREATMENT:
- ibuprofen
- high fluid intake
- inhaled steroids
- antihistamines
- antibiotics
- antiacids
- stop smoking
when you should consult a doctor :
- cough that stays more than a week
- weight loss
- difficulty swallowing
- chest pain
- fever
- coughing up blood
- difficulty breathing
lab test:
- CBC
- CHEST X-RAY
-  sample of phlegm 
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Kind Regards