Transitions are highly stressful and distressing because they force people to stop and reflect. Transitions such as starting a family and getting married or dealing with a loss or disability can be very distressful. People are naturally resistant to change, either consciously or subconsciously. Changes elicit fear, uncertainty, and stress.
For instance, marriage forces people to surrender some of their decision-making responsibilities to the partner. The changes can be overwhelming and stressful even though they are part of normal life processes. Most transitions are difficult because the individual has not adjusted to the new environment or reality. It takes time for the mind and body to adapt to a new environment or reality.