Symptoms are expressed on all levels of your being - physical, mental, emotional, and spiritual; they are a manifestation of imbalance within the 'vital force' (life force). 

"The totality of these symptoms is the outwardly reflected image of the inner wesen (essence) of the disease, that is, of the suffering of the life force.  Hahnemann (1)

Through the matching of symptoms with the correct homeopathic remedy, the body's defense mechanism is stimulated to heal itself.  

"In the state of health the spirit-like vital force (life force) animating the material human organism governs without restriction and keeps all parts of the organism in harmony. The vital force can thus freely use this healthy living instrument for the higher purpose of our existence." Hahnemann (1)

Homeopathically prepared remedies are gentile, subtle, and powerful. They are non-addictive, and once the body's defense/healing mechanism is stimulated into action are no longer needed. 

 (1) Hahnemann, S., 1842. Organon of the Medical Art. 6th ed. Palo Alto, California. Birdcage Press.