Hello dear, There is a connecting tract (known as Eustachian tube) between the nasopharynx & middle ear through which infection can spread to ear. Also obstruction to this Eustachian tube, secondary to an upper respiratory tract infection, sinusitis, cold & congestion, can lead to locking/ pain in ear by causing un-equalisation of pressure between the nasopharynx & middle ear. Management includes: 1. Antihistamine preparations like Allegra. 2. Decongestant nasal drops. 3. Antibiotics based on culture & sensitivity reports. 4. Analgesic like Paracetamol. 5. Steam inhalation and warm salt water gargle. 6. Maintenance of adequate hydration & nutrition status of the body. 7. Protection from cold, dust & other allergens. Wish you good health & a speedy recovery. Take care.