According to Ayurveda disease is imbalance of dosha in the body. So when a person gets diseased his dominant dosha gets initially affected.
The type of disease a person is susceptible to thus depends on the type of his Prakruti.
For example- If a person with a Vata dominant Pitta Prakruti; consumes excessive meat, alcohol, & stay a wake late at night then his Vata dosha initially gets affected which in turn affects the Pitta dosha. As a result the person suffers from diseases like constipation, indigestion, sleepiness, etc. And if he continues such a diet he might suffer diseases like habitual constipation, skin disease, joint pain, etc.
