Difficulties In Maintaining Wudu
The principle in matters of ibadah is usar (‘ undue difficulty ‘), whether it is due to any medical reason or any other circumstance. If the nullifiers of Wudu happen due to usar, for example , medical reason resulting in incontinence will fall under exemption. In such circumstances, only doing wuzu in pure state once would suffice ( see : Discussion 59287 ) . It is for a person to decide which situation falls in Usar and which does not, as long as the decision of the person is honest, then hopefully any mistake made in making such determination will be forgiven by Allah. In the absence of Usar, if a wudu nullifier happens then the person has to redo their wudu ( For Wudu Nullifiers , please see: Discussion 36957 • Reply 37010 ). It does not matter how a wudu nullifier happens, the primary determining factor is the presense/absence of Usar. To understand the principle of Usar in short, please refer to the video below from 10:30 to 13:06 https://youtu.be/4vMthgdqYHg?t=630