Yes, it is because of Eustachian tube dysfunction (tube connecting back of the nose with middle ear).
Next Steps
thorough ear & nose examination is warranted
Health Tips
frequent salivation improves ET dysfunction.
tab. L Dio 1 M 1 HS &
Xylometazoline nasal spray 2 puffs 3 times a day..
if not improved within 5-7 days, please consult an ENT Doctor.