Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements.
Thank you for your question. Although it is not possible to know the mind of God and all of His purposes, what we are sure of is that a Merciful, Wise and Just Lord would only allow an innocent to suffer if there was a benefit that accrued to that innocent which was worth their suffering in this world. In the case of a child that would be something like a swift entrance into heaven or a higher station within it. As the test pertains to the parents and relatives as well, if they are patient through it they will also be rewarded accordingly.
May you always be successful.
The Ulama did not find in consuming betel nut any damaging harm to the health, that is why we don't see a verdict against it. Some materials which are mixed with betel nut can be very harmful like tobacco. Consuming any item which damagingly harmful must be avoided.
We don’t have such claim regarding cancer in our authentic books of Hadeeth.
We have in Sunni and Shia books that every lover of Ahlul Bayt ( AS) dies as Shaheed ( martyr). من مات على حب آل محمد مات شهيدا
Tafseer Al-Kashshaf, Tafseer Al-Razi and other Sunni books.