-Triads in medicine.

There are many things in medicine
collected as triads....

1. Ecological triad ...look here.
2. Malarial triad...look here.
3. Beck's triad...look here.
4. Gradenigo's triad...look here.
5. Trotter's triad...look here.
6. Cushing's triad..look here.
7. classic triad of Henoch–Schönlein purpura...look here.
8. Virchow's triad....look here.
9. Charcot's triad.look here.
10. Atta's triad.look here.
11. Hutchinson's triad.look here.
12. Saint's triad.look here.
13. Whipple's triad.look here.
14. Anderson's triad.look here.
15. O'Donoghue's triad.look here.

wait the other triads...

or you can tell us another triad.