A persistent cold that interferes with your daily work is usually due to a viral infection, but it can also be worsened by allergies, sinus issues, or weak immunity. Most simple colds improve within a few days, but if symptoms last longer, you need to focus on supportive care; get adequate rest, drink plenty of warm fluids, and eat light, nutritious food to help your body recover. Steam inhalation and warm saltwater gargles can relieve nasal blockage and throat discomfort. You may use basic medicines like Paracetamol for fever or body aches and a suitable antihistamine for a runny nose, but avoid taking multiple medicines without advice. If you have thick yellow or green nasal discharge, severe headache, high fever, or symptoms lasting more than a week, it is better to consult a doctor to rule out a sinus infection or other causes. Maintaining good hygiene, avoiding cold exposure, and strengthening immunity with proper sleep and diet can help prevent recurrence.