One of the most common causes of acute pain is a. trigeminal neuralgia. b. malignancy. c. headache. d. fibromyalgia.

Answer: Headache

Explanation:

The most common cause of the acute pain is headache. It can be specific or non specific.

The pain in the head can be caused due to any of the reason. It can a normal headache due to be being hungry for a longer period of time.

It can be a migraine pain, it can be pain due to tumor in the brain. There can be pain due to some injury.