Causes for Osteoarthritis
Standing jobs or lifting weights
People who do such jobs which they have to stand for longer periods of weight lifting, this puts more stress on joints and leads to OA.
Age
The capacity of cartilage to restore itself declines as we age.
Weight
If you are overweight then more stress you set on your knee joints and that put pressure on joints and cartilage.
Injury
Knee injury can cause osteoarthritis later in life.
Causes for Gout
Obesity
Decreased kidney function over a long period of time using certain medications such as diuretics
Genetic Causes
If your parents have gout, then you may have chance for gout.
Age and Gender
Cases of gout are more common in men, mainly because women have low levels of uric acid. However, after menopause, the uric acid level of women becomes similar to that of men. Men are usually more likely to develop gout between the ages of 30 and 50, while women develop these symptoms and signs after menopause.
Chemotherapy
Chemotherapy done to eliminate cancer can also cause gout, because the cancer cells destroyed by it make a lot of uric acid and this becomes the cause of gout.
Diet
Generally high purine diet leads to higher concentration of uric acid in blood.
Causes for Rheumatoid arthritis
Genes
Genetics do not seem to play a significant role in this condition, although the disease has been seen to run in families.
Hormones
Rheumatoid arthritis is caused by an imbalance in the hormone estrogen. Therefore, the condition is more common in women than in men.