If by natural you mean found in nature, most analgesics are based on chemical processes or are made by refining natural substances into those which are useful. For example, acetylsalicylic acid, or Aspirin as it is commonly known, was first isolated from willow bark. Morphine many similar analgesics are derived from Opium, which is obtained from poppy seeds. If you mean holistic or alternative medicine pain killers, there are none of which I am aware which have been proven in studies to be as effective as those used in medical practice.
It is said for centuries than hashish is the best pain killer
Endorphins
Not automatically, no. Some "pain killers" are depressants and others aren't. Aspirin, for example, is an analgesic ("pain killer") but not a depressant.
Most are, some are not.
pain killers are a type of drug that relieves pain
There may be some side effects of cold and pain killers taken for chest congestion. This may be liver damage or even death, in case of over dosage of pain killers.
Take a nap! And take some pain killers
There are some Non-Perscription pain killers such as Asprin, Tylenol, or ibuprofen. For stronger stuff, ask your doctor
Pain killers only do just that- help to kill pain. Pathogens such as bacteria are not killed by pain medicine. Antibiotics are prescribed to kill some pathogens, but currently no antibiotics are also pain killers as well.
To kill pain.
To relieve pain
Natural Babe Killers was created in 2000.