Pain is an unpleasant feeling that tells your body you might be injured.
Injuries, such as cuts, burns, fractures, sprains, and bruises, activate pain receptors around the injury. The pain receptors are on the ends of long nerve fibers. These fibers carry pain signals to your spinal cord. Other nerves in your spinal cord then carry the pain signals to your brain. Only when your brain processes the pain signals do you actually feel pain.
Sometimes your nerves send pain signals even when you haven't been hurt or injured. This can happen when your nerves have been damaged by a disease such as diabetes (called diabetic neuropathy), or when your nerves were crushed or cut by an injury. Pain caused by nerve damage is called neuropathic pain.
Referred pain is when pain from one part of your body is felt in a different part. For example, pain from a heart attack is usually felt in your chest, because that's where your heart is. But sometimes a heart attack causes pain in your neck or jaw, because pain signals from those areas travel along nerves that are near the nerves from your heart.
Anxiety, depression, or sleep problems can make pain more unpleasant than it would normally be.
Doctors first treat the problem that's causing your pain. For instance, if you have a broken bone, they'll set it and put on a cast.
They also may give you medicine to stop the pain. Different types of medicine work on different parts of the pain pathway:
Numbing (anesthetic) creams and gels go on your skin to block pain receptors
Numbing shots in your skin or along major nerves block pain signals in those nerves
Numbing shots around your spinal cord (such as an epidural for having a baby) block pain signals in your spinal cord
Pain pills and shots (analgesics), such as opioids and NSAIDs and other non-opioid medicines, affect pain signals all over your body
For neuropathic pain, doctors sometimes have you take an antidepressant or antiseizure drug. These drugs affect nerve signals in a way that relieves pain even if you're not depressed or don't have seizures.
Some pain treatments don't involve drugs.
Transcutaneous electrical stimulation (TENS) applies a gentle electrical current to your skin through a small sticky pad. The current tingles but doesn't feel like a shock. It won't eliminate pain, but it can help some people.
Doctors can also apply electrical stimulation to your spinal cord. They implant a small wire electrode around your spinal cord and send signals that interfere with pain signals.
In acupuncture, practitioners place small needles in certain parts of your body and remove them after a few minutes. They may apply a small electrical current to the needle. These needles seem to help relieve pain, although doctors aren't sure why.
Special mind techniques such as biofeedback, relaxation training, breathing techniques, and hypnosis can help you cope with pain.
Opioids are the strongest pain medicines. They’re called opioids because they first came from the opium poppy. Some opioids still come from plants, but many are made in a lab. There are many different opioids, including morphine, oxycodone, fentanyl, and codeine.
Opioids are good for relieving really bad pain, such as from a burn, broken bone, or cancer. But opioids can have serious side effects so doctors try not to use them for less severe problems.
Opioids make you feel good. Once you start taking an opioid, it can be very hard to stop. That can lead to a substance use disorder. One reason it's hard to stop is that you get drug withdrawal symptoms.
Opioid withdrawal can develop even if you take opioids for less than a week. Withdrawal is worse the longer you take the drugs. Symptoms of opioid withdrawal include:
Fortunately, opioid withdrawal won't kill you.
To minimize your chance of developing addiction, doctors:
NSAIDs are non-opioid pain medicines related to aspirin and ibuprofen. They also block inflammation, such as when a joint is inflamed from arthritis. They aren't as strong as opioids, but they're very effective.