What could cause head pressure when defecating, and itching anus after passing a stool?

Constipation: Constipation could cause symptoms like this. Be sure you take in enough water and fiber, exercise regularly, and be wary of certain medicines that are known to cause constipation. Hope that helps!

Pushing Hard: It sounds as if you may be pushing too hard to move your bowels. You might be able to move bowels easier by increasing laxative fruits in your diet: raisins, prunes (or juice), apricots, peaches. Don't overdo it. Start with a small serving and wait for at least 8 hours. Itching is from small tears in anus. They heal quickly. Head pressure from holding breath and pushing. If not, see MD.