It accumulates in fat of our bodies and builds up.
One of the major side effects is it causes depression.
Styrene is primarily a synthetic chemical, made from Benzene.
EPA has found styrene to potentially cause the following health effects when people are exposed to it at levels above the MCL for relatively short periods of time: nervous system effects such as depression, loss of concentration, weakness, fatigue and nausea.
Styrene has the potential to cause the following effects from a lifetime exposure at levels above the MCL: liver and nerve tissue damage; cancer."
According to Agency for Toxic Substances and Disease Registry (ATSDR).