Had a hit to the head couple month ago but its now hurting why is that so?

It's possible that the pain you're experiencing from the head injury could be due to lingering effects like post-concussion syndrome, which can cause headaches and other symptoms even weeks after the initial trauma. Additionally, issues such as tension headaches or even changes in the neck and spine due to the impact might contribute to ongoing pain. It's important to consult a healthcare professional to assess your symptoms and rule out any serious complications.