I'm experiencing some itching and a sensation of something pinching in my anus, but I can't see anything there. It mostly happens when I'm sitting or if I'm walking quickly. What could be causing this?
Your symptoms suggest anal itching (pruritus ani) or rectal pain, possibly due to hemorrhoids, anal fissures, or levator ani syndrome, exacerbated by pressure from sitting or walking; consult a gastroenterologist or proctologist for a proper evaluation and treatment.