[quote]no expat experience will be free of deep culture shock, even in English-speaking countries. Cultural [adjustment] can be as acute of a mental health issue as depression.
Of course it could be, but there are also those who take to a new place like a duck to water and who understand and thrive, embracing the differences without being undone by them. All depends entirely on the person and the situation. Discovering differences in behavior, attitudes, sense of humor, customs, laws, etiquette... it's part of the deal. If a person has spent any time in the country to which they have moved, or if he simply makes a little effort to maintain an attitude of 'I'm curious and want to learn, what I don´t know I'll find out as I go,' there's no reason he can't land very nicely and without 'deep culture shock.'
Those who keep one foot firmly planted in the country where they're from and who rank every little thing poorly because it's not exactly like what they once knew may, unsurprisingly, come out sour and unhappy. The paper towels are different, the way you pay for things is different, the way people stare you up and down in the street but don't say hello is different, the food is different, the hours, tthe questions you are asked as a newcomer, the types of shops and restaurants, how children behave, friendships and family relations, how difficult it is to get a driver's license, how strange it is to live in a place where a car is not necessary, the prices, the post office, banking, nothing is exactly like what they were used to. But, better or worse or just different, why is that a bad thing?
People disposed to hating change are in for some surprises and maybe a rough time. But hopefully more people change countries hoping to embrace some change and find a new place for themselves in every sense. Some people averse to change find a little expat bubble and try not to stray from it, others want the full experience and love what they find.
No doubt there are people who could move from rural Texas to rural Oklahoma and and everything that came out of their mouths would start, 'Well, back in Texas...' Some people never adjust to food that isn't made exactly as their mother made it. Some people overestimate that a new place is the solution to old problems. Those sorts don't need to cross time zones and international borders to be grumpy and unhappy and hate the way things are done, it may as well be part of their DNA.
Yes, moving from one country to another will have its differences and adjustments. Whether those amount to depression and mental health concerns, however, is down to the individual.