Pain can be steady and constant, in which case it may be an ache. It might be a throbbing pain - a pulsating pain. The pain could have a pinching sensation, or a stabbing one. Sometimes pain could also be a side-effect of drugs or caused by internal symptoms.
Analgesics are good at relieving nociceptive pain, but not neuropathic pain. Chronic pain - long-lasting pain - may need other non-drug treatments as well.