Immigrants may find it difficult to adapt to the environmental and social conditions of the host nation. Very often they experience homesickness as the food, culture, language, mannerisms , weather conditions may all differ. Adapting to so many differences creates stress and other psychological problems such as loneliness and withdrawal.
Sometimes immigrants face discrimination especially if they belong to a different race. They are perceived with prejudice and not treated as equals by the natives, which makes them feel like outsiders ad insecure.
It has been observed of a large proportion of emigrants from developing countries that they end up performing menial tasks and lowly jobs, which draws much lower income than the natives in developed countries.
Women participation in emigrant labour force has also increased especially because women are willing to take up low paid jobs abroad such as maids, domestic workers , cleaning women, nannies etc.
Migration leads to fusion of cultures. The natives may find these influences threatening to their identity and resist mingling freely with the immigrant population. The immigrants tend to stick together in an expression of solidarity and form ghettos.
Immigrant labour contributes to the growth of the host nation to which they provide their services. This is because they earn, spend, save and invest in the host nation, which adds to the economic activities there. The fact remains that the host nations get gains out of the immigrant labour without having contributed towards the development of these human resources.
Increase in the population of host nation puts pressure on the infrastructure and facilities available. It leads to congestion and a rise in various social problems.