Speaking of the hectica that comes (along) with fever; sometimes it comes accidentally, for he who avoids his work, retains the superfluities, which through want of windiness go to heat, and corrupt. Hectica follows every putrid fever that comes frequently, or continues and remains long. In this way, I grant that heavy labours and weak immoderate exercise produce hectica of themselves, while long lying in prison and avoiding regular occupation cause it accidentally. Excessive coitus does the same, also great flux of the belly (diarrhoea), excessive haemorrhoidal or catamenial flow, or that of urine, or excessive vomiting; constant vigil, or excessive meditation; and everything that heats and dries the body unduly. Avicenna says, fever is frequently generated by too violent purging, and especially hectica.