Homoeopathy system of medicine has a strong logical and philosophical background.  This system believes in the philosophy of soul (life energy), similar to the Indian Mythology.  Any disturbance in the life energy, by any reason, whatsoever, causes disturbance in the health.

Mind is considered as the greatest cause of the disturbance of this life energy because any disturbance in the mind causes disturbance in the health. 

Yogic science also believes in the same philosophy and considers mind as the cause of most of the diseases.  Breathing exercises (Pranayams) and meditation help in relaxing the mind and thus, contribute to a good health.