For example, having ceramic tile installed on a cement floor will likely cost more than having the same tiles installed in a kitchen sitting on a wood foundational surface. The latter example requires fewer materials and less time to complete the installation.
A lot of things can cause stress. You may feel stress when you go on a job interview, take a test, or run a race. These kinds of short-term stress are normal. Long-term (chronic) stress is caused by stressful situations or events that last over a long period of time, like problems at work or conflicts in your family. Over time, chronic stress can lead to severe health problems.
1 Prolactin, a hormone that stimulates breast development and milk production during pregnancy, may cause the breast tenderness associated with PMS.  Cortisol is a hormone involved in the body's stress response. An excess of cortisol can cause anxiety and insomnia, whereas a deficiency can lead to depression and lethargy. One study found that women with PMS-related depression had an imbalance of cortisol levels compared to women who had few or no PMS symptoms.