Answer
Wa `alaykum As-Salamu waRahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- There is no harm in crying due to illness if it is simply tears coming from the eyes, without wailing.
2- There is also no harm in talking to your relatives and friends about your disease as long as you praise Allah, thank Him and extol Him, and ask Him for health, following the permissible means.
Answering your question, the late Saudi scholar, Sheikh Ibn Baz (may Allah have mercy on him) stated:
There is no harm in crying due to illness if it is simply tears coming from the eyes, without wailing. This is based on Prophet’s statement, when his son Ibrahim had died,
“The eye tears, the heart grieves but we do not say anything except what is pleasing to the Lord. We are, by you departure Ibrahim, certainly grieved.” (Al-Bukhari and Muslim)
Hadiths with that meaning are many. There is also no harm in talking to your relatives and friends about your disease as long as you praise Allah, thank Him and extol Him, and ask Him for health, following the permissible means.
We advise you to have patience and hope for reward from Allah. I give you glad tiding as Allah has stated:
“Only those who are patient shall receive their rewards in full without reckoning.” (Azl-Zumar 39:10)
The Prophet (peace be upon him) also said:
“A Muslim is not afflicted with fatigue, sorrow, disease, sadness, or hurt, even if it be the prick of a them, except that due to it Allah expiates some of his sins.” (Muslim)
The Messenger of Allah (peace be upon him) also said:
“If Allah wants good for a person, he afflicts him with trials.” (At-Tirmidhi and Ahmad. Al-Albani says it is sahih.
We ask Allah to grant you cure and health, as well as goodness of the heart and deeds.
Almighty Allah knows best.
Source: Islamic Fatawa Regarding Women, Compiled by Muhammad Ibn Abdul-Aziz Al-Musnad and translated by Jamal Al-Din Zarabozo, Darussalam, 1996.