Illness and sickness is sometimes a means of purifying one from worldly blemishes and sins. There are also other occasions when Allah Ta'ala wishes to raise the stages of the sick person. It could also come as a test, for which the person needs to exercise immense patience.
To take treatment and seek a cure for one's illness is a Sunnah.
It is important to learn and be informed about what Nabi (Sallallahu Alaihi Wasallam) said with regard to illness and sickness:
Do not use Haram (impermissible) medication, unless nothing else is available and use of the “impermissible” medication is unavoidable. Advice of an Alim or an Allah-conscious medical doctor should be sought.
Never become despondent ……. never lose hope in the mercy of Allah Ta'ala.
There is no harm about the person complaining about the pain on the body.
On one occasion, Nabi (Sallallahu Alaihi Wasallam) had a cloth tied tightly around his Mubarak head and he was repeating: “Waa ra'sah” (Oh what a pain in my head!)” due to the severity of his headache.
Once, Hazrat Umar (R) was sick and he groaned out of extreme pain. Some people remarked: "O Ameer-ul-Mu'mineen, do you also groan out of pain? Is this not going against patience?” He replied: “Subhaan-Allah! When Allah Ta'ala has given me sickness to show me how helpless I am and for me to acknowledge my weakness, why (then) should I oppose it and display my strength?” (Marz bhi Allah ki Rahmat he)
Never curse the illness, for it is indeed a blessing from our Creator.
Never wish for death, irrespective of the intensity or type of illness.
Make abundant Dua for oneself, family and the Ummah since the sick person's Dua is readily accepted.
Hazrat Umar bin Khattab (R) narrates that Rasulullah (Sallallahu Alaihi Wasallam) said: “When you visit sick people, ask them to make Dua for you because their Duas are like the Duas of the angels.” (Ibn Majah)
Try to drink Zam Zam water in small sips daily (if available).
Hazrat Abu Moosa (R) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “When a person falls ill or goes on a journey, then those (good) deeds which he used to perform when he was at home and in good health, are written down in his favour.” (Bukhari Shareef)
Always eat the correct foods and follow the diet prescribed by a reputable and respectable dietician or a medical doctor. Hazrat Umm -ul -Mundhir bint Qais (Radiyallahu Anha) narrates that Rasulullah (Sallallahu Alaihi Wasallam) once came to them with Hazrat Ali t. Hazrat Ali (R) was recovering from an illness and was still weak. Therefore, when he also stood up with Rasulullah (Sallallahu Alaihi Wasallam) to have some fresh dates hanging from a branch, Rasulullah (Sallallahu Alaihi Wasallam) stopped him, saying: “You ought to refrain (from eating the dates) because you are still weak after your illness.”
Consequently, Hazrat Ali (R) did not partake of the dates. Soon thereafter, when Hazrat Umm -ul -Mundhir bint Qais (Radiyallahu Anha) served a dish of beetroot and barley, Rasulullah (Sallallahu Alaihi Wasallam) said to Hazrat Ali (R) : “Have this, because it is good for you.” (Abu Dawood Shareef)
Should you not be able to use water for Wudhu, then make Tayammum --- but never miss a single Salah.
Do not force yourself to eat.
Hazrat Uqba bin Amir (R) narrates that Rasulullah (Sallallahu Alaihi Wasallam) said: “Do not force your sick ones to eat because Allah Ta'ala feeds them.” (Tirmizi)
The sick person should have hope in receiving the rewards for the different sicknesses, as mentioned by Rasulullah (Sallallahu Alaihi Wasallam) (Al Adab)
At times, when a person falls ill, he begins to make promises in his heart to Allah Ta'ala that, if he is cured, he will do certain good deeds or he will refrain from a particular sin, etc. When he is cured, he should ensure that he fulfills the promises that he has made.
Ibn-us-Sunni (Rahmatullahi Alaihi) records that a Sahabi by the name of Khawaat bin Jubair (R) said: “Once, when I fell ill, Rasulullah (Sallallahu Alaihi Wasallam) came to visit me. He (Sallallahu Alaihi Wasallam) asked me: 'O Khawaat has your body healed'?” I replied: “O Rasulullah r! May Allah Ta'ala bless you with good health.” Thereafter Rasulullah (Sallallahu Alaihi Wasallam) said: “Whatever promises you have made to Allah Ta'ala should (now) be fulfilled.” I replied: “I have not made any promises to Allah Ta'ala.”
Rasulullah (Sallallahu Alaihi Wasallam) replied: “Why not? Whenever a person falls ill, he makes promises to Allah Ta'ala. Hence, fulfill your promises with Allah.” (Adhkar)
Salah is the most powerful way to cure the illnesses of the body. Nabi (Sallallahu Alaihi Wasallam) would resort to Salah in warding off any difficulty.
Hazrat Abu Hurayra (R) was lying on his stomach. Nabi (Sallallahu Alaihi Wasallam) said to him: “Are you suffering from stomach pain?” He replied: “Yes.” Rasulullah (Sallallahu Alaihi Wasallam) responded: “Then get up and busy yourself in Salah, for that will heal you.”
Imam Ghazali (Rahmatullahi Alaihi) has written in Ihya - ul-Uloom that the sick person should observe the following:
1. Adopt the beauty of Sabr (Patience)
2. Engage in Dua
3. Have trust in Allah Ta'ala
4. Constantly remember Allah Ta'ala by making Zikrullah.
Advice For The Patient
Everything - good and the bad - is from Allah Ta'ala. Good health is indeed a great bounty and a treasured gift from Allah Ta'ala. Having little or no wealth is incomparable to the blessing of good health. Therefore, one should continuously thank Allah Ta'ala for the good health that He has gifted us with.