Acute pain is sudden pain that comes and goes fairly quickly. Chronic pain lasts for more than three months. Chronic pain has a lot of causes. A long-ago broken bone might give you trouble, especially right before a storm. A joint giving out is very painful.
There are conditions where chronic pain is your first indication that something is very wrong. If you are having chronic pain without being able to link it to an old injury, you should go to a doctor. If you’ve been outdoors, check out number 5. And if you have the symptoms of number 2, you aren’t imagining it – you need to head to a neurologist!