1) Garlic
Garlic is the best natural home remedy for back ache.  You need to apply garlic oil to the affected areas every morning for about fifteen days.  Allow the oil to stay on your back for about three hours before you remove it with a warm bath.  You prepare this garlic oil by taking ten cloves of garlic and adding them to 60ml of oil in a frying pan.  You should fry the garlic cloves on low heat until they are brown.  After the oil has cooled down, it is then ready to use. The choice of oil can include sesame oil, coconut oil, or mustard oil.

Garlic

2) TENS Unit
A TENS Unit is most effective at relieving pain anywhere on the body such as sore joints, back and kneck. It is an inexpensive, commonly used, electro stimulation device and it has no known side effects.

3) Tiger's Balm
For a muscle back ache, try Tiger’s Balm.  You can also buy this in patches so it doesn’t get on your clothes.  This home remedy for back ache has been used for centuries with good results.
 
According to Yogis, there is a process to eliminate back pain in a few days.  Sit in a comfortable chair and raise and put your right foot on your left lap.  Next, rub the innermost part of your foot from the heal area to the ball of your foot using your thumb.  Try to massage away the soreness.  Do this for about five minutes before switching to the other foot.  If you experience difficulty in being able to do this; then, have someone else do this for you.  
 
4) Horsetail
Backache is a common condition that can affect everyone.  Almost all adults are afflicted at some time in their life.  But it is a condition not restricted to adults, even children can experience backache. Sometimes it’s hard to determine the original cause.  You often hear the term sciatic nerve associated with backache; however, this is more rare than perceived.  There can be many causes or a combination thereof that can result in backache.  I’ve discovered that the most common cause for backache is a certain degree of kidney dysfunction.  A great home remedy to treat backache and thus kidney dysfunction is Equisentum Arvense or more commonly referred to as Horsetail.  The natural weed Horsetail has been researched; and found to help the kidney, urinary tract, and of course your back.  This remedy can be traced back to a small village in Hungary where the people would soak in a large basin filled with water and horsetail that had been soaked in water, boiled, then added to the water in the basin.  These people would soak for twenty to thirty minutes and have tremendous success in relieving the symptoms of backache and continue their hardworking way of life.