Culture shock refers to the feelings of disorientation or stress someone experiences when immersed in an unfamiliar culture. There are typically four phases of culture shock: 1) honeymoon phase, where the new culture seems exciting; 2) frustration phase, as differences become apparent and excitement fades, causing stress; 3) adjustment phase, where one learns to navigate the new culture; and 4) mastery phase, where one feels comfortable participating in both cultures. Symptoms of culture shock include homesickness, language barriers, changes in sleep and digestion patterns, and difficulty accessing healthcare.