Life is divided into three equal segments of 30 years
each:
| 
    Segment  | 
   
    Age Range  | 
   
    Disease Trigger Conditions  | 
  
| 
   Phase 1  | 
  
   0–30 years  | 
  
   Disease manifests if all four key
  parameters—Ascendant, Ascendant Lord, Moon, and Sun—are either under
  malefic influence or badly placed.  | 
 
| 
   Phase 2  | 
  
   30–60 years  | 
  
   Disease may arise if any two of the above four
  parameters are afflicted.  | 
 
| 
   Phase 3  | 
  
   60–90 years  | 
  
   Disease tends to occur if only one of the four
  parameters is under malefic influence.  | 
 
Additional Conditions for Disease Manifestation:
- Disease
     occurs only during the Mahadasha (MD) or Antardasha (AD)
     of: 
 - Lords
      of the 2nd, 6th, 7th, 8th, or 12th houses
 - 64th
      Navāṁśa lord (from Ascendant or Moon)
 - 22nd
      Drekkāṇa lord (from Ascendant or Moon)