Cold feet or fingers may indicate serious problems or stress, but may also indicate a lack of iron in the blood. Read below some of the symptoms that you should not ignore. To maintain constant internal body temperature, thermogenesis has the following role: the brain orders the capillaries to spread for the blood and thus to provide heat or to be tightened to slow the blood flow and cooling. If this mechanism is not perfect, first it is going to be felt by the limbs that are farthest from the heart In some cases, cold hands or feet can be a sign of serious health problems that should be examined and treated.
If other than cold hands, you constantly feel tired, your heart beat faster and often feel dizzy, check the iron levels in the blood, because you might suffer from anemia. Iron is a major component of hemoglobin, the molecule that transports oxygen to the blood and gives it a red color. If iron level is below normal, there is less hemoglobin, and tissues have less oxygen to produce heat.

Tingling in the hands followed by pains in the shoulders, back, neck can be associated with osteoarthritis – by wasting the cartilage of joints. Arthrosis may occur around the age of thirty. If the shoulders are often in the clamped position, flow of the blood supply is harder to the hands and fingers. Stress can cause feelings of cold hands and feet. It increases production of adrenaline, a hormone that is produced in the adrenal glands to contract the blood vessels.
Here are a few small tips you can do at home to warm hands and feet:
Regularly take a shower changing hot and cold water (in the evening and morning)  it strengthens the circulation
Wear cotton socks, not necessary to be thick
Never stay in wet shoes or socks, change them regularly.
Movements that we do while seated make miracles, in particular they reinforce the circulation. It is convenient to do the exercise on ball with spines Avoid the «pleasures» such as nicotine and alcohol. Nicotine narrows blood vessels and your feet are cooled faster Alcohol, however, widens the blood vessels so the body loses heat.