For lung and heart diseases

Form a reverse letter J with each hand, with your index finger and your thumb. Hold them together, with your fingerprints pointing each other. If there’s no space between your fingernails, it may be a sign of nail clubbing, which is a sign of oxygen deficiency. This means you should check your cardiovascular system or lungs. Also, lack of oxygen in the blood may also be a sing of gastrointestinal issues.

Hormonal imbalance

This test is done through your hair. First of all, your hair should be freshly washed and dry. Pull out a small lock of your hair and if it only has 2-3 hairs, it’s perfectly normal. If you have more and you didn’t use much force to pull it out, you should visit a doctor, because it might be a sign of hormonal imbalance, caused by stress, poor hygiene or some other serious health issues.