I feel a worm squirming in my anus. What's going on?

Anus feel worms in wriggling, first of all, consider hemorrhoids, mainly anal internal blood vessels varicose veins, long-term varicose veins lead to functional disorders of anal blood circulation, leading to anal mucosa damage, and cell necrosis and infection, will cause like worms wriggling lead to itching.

Second, consider intestinal parasite infection, intestinal parasite infection, especially pinworm infection, will lead to a clear sense of anal internal, even the external appearance of worms wriggling itching symptoms, especially at night.

Anal eczema and perianal abscess, can also cause anal parts due to moisture, bacterial infection, resulting in anal internal active itching like worms.