Police were called to the home, a residence in Soi Khuen Bangwad in Moo 7, Kathu, at 6:55pm.
Police and rescue workers arrived to find the woman, identified as Phakwalan Khocharoenkiat, hanged from the stairs inside the house.
Her father, Chusan Khocharoenkiat, told police he had discovered her body after becoming concerned when she could not be reached.
According to Mr Chusan, Ms Phakwalan had been living at the house with her boyfriend, who had recently travelled to Bangkok, leaving her alone.
He said she may have been struggling with stress and overthinking. She had previously received treatment for depression.
Police said there were no signs of foul play or struggle at the scene, and family members did not suspect any wrongdoing. The body was sent to Vachira Phuket Hospital for medical examination in accordance with standard procedures.
If you or anyone you know is in need of emotional support and counselling, please contact the Samaritans of Thailand at their hotline 02-1136789 (English & Thai) or the Thai Mental Health Hotline at 1323 (Thai).