Forrest Gump, the titular character of the 1994 film of the same name, was portrayed as a man with a low IQ but a kind heart who achieved great success in his life despite facing numerous challenges. While the film does not specifically mention any diseases that Forrest Gump had, there are several conditions that he exhibited symptoms of throughout the movie.

One of the most notable conditions that Forrest Gump displayed symptoms of was scoliosis. This is a condition in which the spine curves sideways, leading to uneven shoulders, hips, or a tilted head. Forrest is shown wearing leg braces as a child, which could have been related to scoliosis or another orthopedic condition. This may also explain why he ran with an unusual gait.
Another condition that Forrest Gump may have had is developmental disability or intellectual disability, which was referred to in the movie as “being a bit slow”. This is characterized by below-average intellectual functioning and limitations in adaptive behaviors, which can include difficulties with communication, social interaction, and self-care. In the film, Forrest struggled with reading, writing, and understanding social cues.
Forrest Gump also exhibited symptoms of post-traumatic stress disorder (PTSD) following his experiences in the Vietnam War. PTSD is a mental health condition that can develop after a person has experienced or witnessed a traumatic event, such as combat, a natural disaster, or a serious accident. Symptoms of PTSD can include flashbacks, nightmares, hypervigilance, and avoidance behaviors. In the film, Forrest is shown experiencing flashbacks and nightmares related to his time in Vietnam.
Finally, Forrest Gump may have had a hearing impairment. In the film, he is shown wearing hearing aids and struggling to hear certain conversations, which can be a sign of hearing loss. This could be related to a genetic condition or exposure to loud noises, such as gunfire or explosions, during his time in the military.
It is important to note that while the film portrays Forrest Gump as facing numerous challenges, it does not stigmatize or pathologize his conditions. Instead, the film celebrates his resilience, kindness, and perseverance in the face of adversity. It is also important to recognize that people with disabilities and mental health conditions are not defined by their diagnoses and should be treated with respect and dignity.
In conclusion, while the film Forrest Gump does not explicitly state what diseases or conditions the titular character had, there are several conditions that he displayed symptoms of throughout the movie. These include scoliosis, developmental disability, post-traumatic stress disorder, and hearing impairment. It is important to recognize that people with disabilities and mental health conditions are complex individuals who should be treated with respect and understanding.