If you're looking for manga similar to I Wish I Could Say "Thank You", you might like these titles.
In 2001, the manga artist Kyōko Shimazu began to experience uncontrollable shaking in her right hand, then throughout the right side of her body. The doctors she visited told her to relax and that everything was fine. She quit drawing manga and got lots of sleep, but the symptoms only worsened. Increasingly nervous, she went "doctor shopping" for seven years, trying to find out what her problem was. She finally discovered that she has Parkinson's disease, a long-term neurodegenerative disorder.
In 2015, mangaka Shungicu Uchida was diagnosed with bowel cancer. This series is the story of her diagnosis, treatment, and road to recovery, told in her uniquely candid and witty style.
At 38 years old, Hilnama, a manga artist, is diagnosed with colon cancer. Never one to lose hope or give in to despair, she begins cancer treatments despite the deadly diagnosis. But when going through such a grueling process, it can be difficult to keep a positive outlook… When faced with the struggles and trials of life, Hilnama turns to what she knows: writing and creating manga again, drawing herself as a rabbit in a world of humans and hospitals. This poignant and down-to-earth account of diagnosis, treatment, and living with terminal disease will be a reference for positivity and perseverance for years to come.