Heartburn is caused when the stomach produces an excessive amount of acid. This larger than normal quantity of stomach acid means some is able to flow back up the oesophageal tract, which causes the burning sensation and overall discomfort.
Gout can be extremely painful and can also lead to lasting damage to the surrounding tissue in the inflamed area. Gout is most common in men; however women can also be affected by this particularly after they have gone through the menopause.
Sciatica normally involves pain in the lower back (lumbar area) which radiates out towards the knee. It is usually caused by a lumbar disc herniation which directly presses upon the sciatic nerve causing discomfort and pain.