Why does common cold cause blocked nose?

The congested feeling is often driven as much by swollen tissue as by mucus. Blood vessels in the nasal lining widen during the immune response, causing the lining to thicken. This can make breathing through the nose difficult and may reduce the sense of smell or affect sleep. Blocked Nose is a very common presentation of Common Cold. Allergies, sinus problems, irritants, and some medicines can also cause nasal congestion, so a blockage that does not settle with the cold may need review.

Rest, drink fluids, and use saline nasal spray or drops to loosen mucus and moisturise the nose. A warm shower or steam from a shower may feel soothing; take care to avoid burns from bowls of hot water. Sleeping with the head raised can make nighttime congestion easier. A pharmacist can advise whether a short course of a decongestant is suitable for you, especially if you are pregnant, have high blood pressure, heart disease, glaucoma, or take regular medicines.

Seek urgent care for trouble breathing, blue or grey lips, confusion, severe swelling around the eyes, or a severe headache with a stiff neck. Arrange medical advice if symptoms are worsening, persist beyond the expected course of a cold, or come with facial pain, high fever, ear pain, dehydration, or symptoms that concern you. Young children and people with long-term lung conditions may need earlier advice.

Ask whether the pattern fits a cold or another cause of congestion, which treatments are suitable with your health conditions and medicines, and whether you should avoid a decongestant. Tell the clinician if one side stays blocked, your sense of smell remains altered, or nasal symptoms keep returning.