A cold lasting for 6 to 7 days is commonly caused by viral infection, allergy, sinus irritation, weather changes, or pollution exposure. Symptoms such as blocked nose, sneezing, throat irritation, cough, mucus, and body heaviness may continue if the airways remain inflamed or if rest and hydration are inadequate. Dust, smoke, cold drinks, and sudden temperature changes may further worsen the irritation and delay recovery. Warm fluids, steam inhalation, saltwater gargles, and proper rest may help reduce congestion and throat discomfort gradually. Drinking enough water and eating light, nutritious meals may also support faster recovery. Avoid smoking, alcohol, oily foods, and repeated exposure to dust or pollution because these may keep the nasal passages irritated. If the symptoms are due to allergy or sinus congestion, the cold may continue despite temporary relief. Thick mucus, facial heaviness, or worsening headache may suggest sinus involvement. Avoid starting repeated courses of antibiotics without proper medical advice because many colds are viral and improve mainly with supportive care. Consult a doctor if high fever, breathing difficulty, chest pain, ear pain, or worsening symptoms continue beyond several more days.