There's a number of reasons why your lenses might feel uncomfortable.

You might be developing a cold, or there might be some deposits or a nick or scratch on the lens.

It's also possible that there might be debris on the lens, so start by rinsing it with saline or lens comfort solution (never with water or solutions that aren't designed for rinsing - check the box on your solution first).

If this doesn't solve the problem, you should stop wearing the lenses as they could damage the surface of your eye. Consult your optician instead.