Originally Answered: Meditation.Mind and Thoughts?
Effects on physical body
(1) Healthier: One's resistance to disease is increased. That means when colleagues fall sick, one can destroy the same germs or viruses in one's own body due to the increased immunity developed from our daily meditation. Similarly, as cancer cells are popping up in our bodies everyday the meditators can also eradicate these malignant cells as they arise. Conversely, stress reduces our immunity and it may be so reduced that the cancer cells takeover, and start to form a primary colony in the body. The danger of cancer is that it is wild and unruly, and will grow incessantly to the detriment of the healthy body.
(2) Memory and Concentration: The meditator having achieved good concentration, has also a much better memory. He is now less tense and has an increased capacity to handle stress. He appears also to have increased energy with greater physical agility. He is able to sleep better, and the incidence of insomnia is greatly reduced. There is less tension headaches, and irritability. Aches and pains of the body begin to diminish. As mind-body co-ordination greatly improves, the meditator works more efficiently.
(3) Personality: He is now friendlier, and has a more attractive personality. He has more time for others, and is more tolerant of other religions. He is now able to deal with emergency situations without panic. Although he is more patient, he is more charismatic. He is also more sensitive to other people's moods and feelings. Additionally, he is able to take losses and bereavement much better. This adds up to an increased ability to let go: to be less greedy and more charitable.
(4) Psychosomatic illnesses: Conditions such as asthma, neurodermatitis and gastrointestinal problems (e.g. irritable bowel syndrome) begin to disappear as one continues to meditate. Weight is normalised. High blood pressure is also reduced.
After at least six months, one would notice that there is a reduction of anxiety neurosis and nervousness. Depression disappears completely. There are no longer feelings of inadequacy. Being much calmer than before, irritability has also more or less disappeared. On the positive side there is more self-esteem. The meditator can now solve problems better, because his mind is not cluttered with anxiety and unnecessary information. As one's thoughts become more orderly, one's thinking is much more organised, thus increasing one's creativity and productivity.
Meditation tends to make us a better Christian, Muslim, Hindu or Buddhist. Our affiliations to our religions are strengthened. It also tends to foster trust with a greater capacity for intimate contact. One develops more compassion for our fellow human beings, and there is also a greater capacity for unconditional love, which means that the meditator does not expect any gratitude or thanks. There is an increased satisfaction at work and at home, and consequently we develop inner wholeness. We now know that life is meaningful. Of course, the greatest achievement would be our ability to let go: to have less greed, hatred, pride and selfishness. These four foibles when considerably reduced will affect our spiritual well-being tremendously.