My gums around my crown is swelling and its spreading near gums . what is the reason and how can it be solved?

It is likely that you are having some bacteria trapping between your crown and your gum line.  I would suggest going to a dentist to have your crown evaluated.  Often times, a great cosmetic dentist can simply clean this margin at the gum line and give your a prescription mouthwash and resolve the issue.  If your gums are inflamed, you may need an antibiotic or a NSAID (non-steroidal anti-inflammatory drug) like ibuprofen to reduce the swelling.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMD

This is not a problem that can be diagnosed without actually seeing and examining you.  Go to your dentist, this is the best thing for you to do.You could have an abscess, and ill fitting crown, a metal reaction to the metal inside the crown, you may have poor oral hygiene, etc.  There are many reasons and your dentist is the one who should be treating and solving your gum problem.