Pitta governs fire and metabolism. Not simply digestion of food, but knowledge, emotion and sensory assimilation too. No sub dosha works alone, for example your eye colour is a result of the combined work of alochaka and ranjaka.
Pachaka pitta is the function of bile and acid located in the gastrointestinal tract from the stomach to the small intestines. Pachaka regulates the temperature of digestion of food, distinguishing the essence from the waste. Imbalance can lead to poor or irregular digestion, heartburn, ulcers or malabsorbtion.
Once pachaka has broken down the food, ranjaka forms it into the tissues, primarily the blood. Toxins, wether a result of polluted food, water and air, or inadequate pachaka function, will especially imbalance ranjaka pitta. Imbalanced ranjaka can lead to blood disorders including anemia, high or low cholesterol or blood pressure, and chronic fatigue syndrome.
Alochaka pitta lives in the eyes, absorbing images and colours. It plays some role in all the senses and our emotional response. Nearly all eye disorders (except cataracts for example) are a result of imbalanced alochaka.
Sadhaka is located throughout the nervous system, especially the brain and heart. It processes ideas and experiences and governs expression, ambition, intelligence and self esteem. Imbalanced sadhaka may cause heart attack, delusions, confusion or a lack of appreciation and will.
Bhrajaka pitta lives just under the skin, governing it's complexion, temperature and lustre. It processes sensations of touch, temperature and pain. Bhrajaka transforms loving touch into healing and absorbs anything on the skin including sunlight, oils or pollution. Imbalanced bhrajaka may cause seasonal affective disorder, acne, eczema, psoriasis and all sorts of skin disorders.
Find out about the sub types of Vata here.