Dear friend,
This can be a symptom of pain, fear, frustration, agitation, and means your cat is thinking about what is bothering him and how to resolve it.
If he is eating drinking and pottying normally - I would just watch him for any developing symptoms of illness or pain.
If he is very stressed you can get some feliway plugins to safely calm him at www.catfaeries.com or some pet supplies.
This may also be a conflict between him and his brother as each vies for the head cat position.
Please let me know if you have any more questions. I will be happy to help in any way possible.
Very sincerely,
Terri
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri