Baha'i leaders were ordinary human beings.

Baha'u'llah's Chronic Issues: He suffered from a hernia (fateq), a condition his own sister pointed out he was unable to heal despite claims of divine power. He also had visible hand tremors or shaking; while his followers claimed this was the result of being poisoned by his brother, Mirza Yahya Subh-i-Azal, Avarih suggests this was a convenient excuse for a physical infirmity. Additionally, a traveler who met him noted that his left eye was significantly weaker or more damaged than his right.

Intoxication and Physical Collapse: Mirza Hussain Jarullah (a close confident of Baha'u'llah in Baghdad), found Baha'u'llah unconscious and physically ill from drinking too much wine. He was so intoxicated that he was unable to move or maintain basic hygiene.

Shoghi Effendi's Skin Condition: As a young man, Shoghi Effendi suffered from a skin disease (described as gal or a type of mange/itch) that affected his hands, forcing him to wear gloves while he was a student.

Abdul Baha's Final Sickness: Despite his followers viewing him as a source of healing, Abdul Baha died from a sudden fever. He had to rely on standard medical treatments, such as injections, which ultimately failed to save him.

Baha'u'llah's Cause of Death: He passed away after being bedridden for 22 days with a severe stomach illness and diarrhea (zahir).

(Kashful Hiyal (The Discovery of Deceptions) by Abdol Husayn Ayati 'Avarih')

https://archive.org/details/kashful-heel-part-3/Kashful%20Heel%20-%20Part%201/