Low lymphocytes have many causes, many of them temporary. For example, viral infections, severe bacterial infections, and certain antibiotics can all temporarily lower your lymphocyte count. Some causes, however, are serious. These include certain cancers, autoimmune diseases, and disorders that reduce bone marrow function.  If you suspect a serious issue, your doctor can make a proper diagnosis and create a treatment plan. Better treatment options may be available to you, such as a bone marrow transplant. Adults require 7 to 9 hours of sleep to be fully rested. Teens may need up to 10 hours per night, while children may need up to 13. Being tired weakens your immune system by reducing your number of white blood cells. Getting enough sleep supports your immune system. Stress makes your body work harder, which weakens your immune system. It also causes your body to secrete hormones like cortisol that stay in your blood. You become more susceptible to illness, which lowers your white blood count. To avoid stress, add stress-reduction activities to your day.   Try yoga.  Do meditation. Go for a walk in nature. Try deep breathing. Engage in a hobby. . Smoking weakens your immune system, including your white blood cells. Your body will not be able to produce or maintain high levels of lymphocytes. Moderate drinking won't hurt your immune system, but excessive drinking can take a toll on your body. It stresses your system, which prevents it from producing enough white blood cells. Women should limit themselves to 1 glass of alcohol per day, while men should stick to 2. Being underweight or overweight can stress your body's production of white blood cells. Your body may not produce as many white blood cells, and the ones you do have won't function as well. Maintain your weight by eating a balanced diet and getting regular exercise.  Eat lots of vegetables. Include a small serving of lean protein at each meal. Eat 2 to 3 servings of fruit per day. Drink plenty of water. Limit sugars and unhealthy fats. most days. Regular exercise supports your immune system by improving your circulation, which allows the lymphocytes to do their job. Try to exercise for 30 minutes 5 times a week. You should pick an activity (or activities) that you really enjoy. Good options include walking, dancing, biking, hiking, swimming, running, team sports, and rock climbing. While washing your hands is always good, it is particularly important when you are trying to increase the number of lymphocytes in your body. Washing your hands lowers your risk of getting exposed to things that can cause infections, like bacteria and viruses.

Summary:
Talk to your doctor if you have a serious health issue. Sleep the recommended number of hours each night. Incorporate stress-reduction activities into your day. Stop smoking Limit alcohol consumption. Maintain a healthy weight. Exercise Wash your hands often.