Fever, runny nose, and excessive cough are most commonly caused by viral infections such as the common cold, flu, or other upper respiratory infections. In some cases, allergies, sinus infection, throat infection, or chest infection may also produce similar symptoms. Most mild viral infections improve gradually within several days with proper rest and supportive care. Drinking plenty of warm fluids, taking steam inhalation, doing warm salt-water gargles, and getting adequate sleep can help reduce throat irritation, loosen mucus, and improve congestion. Warm soups, herbal tea, and honey with warm water may also soothe a cough in adults and older children. Paracetamol may help reduce fever, body pain, and headache when taken in the recommended dose. Some cough and cold medicines may provide temporary symptom relief, but antibiotics should not be taken without medical advice because many viral infections do not require them. Avoid smoking, cold drinks, dust exposure, and self-medicating with multiple cough syrups or antibiotics unnecessarily. You should consult a doctor if the fever becomes high, the cough lasts more than 1-2 weeks, breathing becomes difficult, wheezing develops, chest pain occurs, mucus becomes thick or blood-stained, or if there is severe weakness or dehydration. A proper examination may be needed to rule out chest infection, allergy, asthma, or sinus-related problems if symptoms are severe or persistent. With timely care and adequate rest, most people recover well without complications.