Common cold and nasal congestion are usually caused by viral infections or allergies, and most cases improve gradually within a few days with proper rest and supportive care. There is no single best medicine that cures a cold completely, but certain medicines may help relieve symptoms such as a blocked nose, a runny nose, sneezing, headache, and body pain. Steam inhalation, warm fluids, adequate rest, and staying hydrated are often very helpful in reducing congestion naturally. Saline nasal drops or saline nasal spray can safely help clear nasal blockage. Medicines commonly used for temporary relief may include antihistamines for sneezing and a runny nose, paracetamol for fever or body pain, and decongestant medicines for severe nasal blockage, but these should be taken carefully and preferably under medical advice, especially in children, pregnant women, elderly people, or individuals with high blood pressure, diabetes, or heart problems. Antibiotics are usually not needed for ordinary viral colds because they do not work against viruses. Avoid cold drinks, smoking, dust exposure, and self-medicating with multiple cough and cold medicines together, as this may sometimes cause side effects without providing extra benefit. If symptoms last more than 7-10 days, become severe, or are associated with high fever, breathing difficulty, chest pain, ear pain, or thick yellow-green mucus, it is advisable to consult a doctor to rule out sinus infection, allergy, or chest infection. With proper care and rest, most cold symptoms improve naturally over time.