If you have diabetes, heart disease, or lung disease, or are pregnant, there are some issues to consider when you're traveling. Read here for more information. Diabetes Diabetics who do not require insulin injections do very well during international travel provided they monitor diet and exercise. Insulin-dependent diabetics should remember that if they are traveling eastward the first day is shortened, and they will need less insulin.
Westward travel means a longer day and thus additional insulin.
One study reported that over half the deaths that occurred in overseas travelers were due to heart disease. Anyone who has experienced a heart attack in the past month or a stroke in the past two weeks should avoid travel. Unstable angina and uncontrolled hypertension make travel dangerous. Thus, those with lung problems should consult their physicians about whether air travel might exacerbate their condition. It is extremely important to avoid blood clots, which form after prolonged sitting.