I have gained weight everyday for around 30 in july i weighed 175 now i weigh 196 what could cause the gain i am white 70 year old female ?

Weight gain: Unexplained weight gain should be investigated by your provider. Metabolic abnormalities such as thyroid and other endocrine issues are possible. Internal growth abnormalities are possible. A change in medication can cause this.

Fluid: The most common cause for rapid weight gain in a mature adult is fluid retention. There are many causes and therefore many different treatments. You should see a doctor soon.