1. Sadhya (Curable)
2. Asadhya (Incurable)
    

• Su-sadhya (easily curable)
• Krccha sadhya (curable with difficulty)
   

• Yapya (controllable)
• Anukarma (unmanageable)
   

• Diseases that  can be cured in a  short while is called su-sadhya. 
• The body of the patient is capable of withstanding all types of therapies.
• The patient has control over his sense organs. 
• The disease has few causes, mild pro-dormal symptoms, mild characteristic features and no complications.
• Doshas, dushyas (tissues), desha (regions), kala (season) and prakruti (constitution of body) are dissimilar.
• Disease arising from only one dosha, manifesting in one pathway only and is of recent onset.  

• It requires more than one difficult method of treatment.
• It has many incurable (distressing) symptoms. 
• Takes long time to develop. 
• It might need surgical and other methods of treatment. 

All such diseases are cured, but with difficulty, hence Krcch - sadhya.
  

• It is that disease which though is generally opposite (in qualities) of the curable, still persist for remaining period of life.
• Giving slight relief by suitable pathya (diet and medicines).
• Getting aggravated again by even trivial causes.
• Does not get cured without leaving remnants.
• Arising from bad actions of the patient.
• Continuing long because the person has a certain definite span (duration) of life. (Hence unable to kill him).
• The patient subsisting by the strength of suitable foods and drugs, just as a crumbling edifice by the support of the pillars.

• Disease in which all treatments fail. 
• Has to be rejected because it possesses qualities entirely opposite to curable.
• It produces giddiness, delusion, restlessness, appearance of fatal signs and loss of function of sense organs.

Even curable (sadhya) diseases, if they are in strong combinations, become incurable (asadhya).