Hi, Welcome to HCM. I have read your query and understand the problem of that girl. Her loud cough could be because of bronchitis (allergic or infective) or pertussis or might be a just one time hard cough etc. If she tends to cough louder and harder continuously the she must be advised to investigated the underlying cause further because her coughing might be contagious. She may need to undergo routine blood count,ESR,sputum examination with x-ray chest and pulmonary function test to rule out any infective lung or respiratory pathology. She might require antibiotics (quinolones or macrolides or amoxillin with clavulanic acid) with cough suppressants anti-allergic drugs like antihistamines or mast cell stabilizers) and antiinflammatories or analgesics on as and when required basis. She must consult your pulmonologist to get diagnosed first and then treatment. Regards,