Family members may see their relative endure side effects of drugs or fly into rages when under the influence of alcohol. Others may see their relatives lose weight rapidly, becoming unrecognizable. Some may not hear from a loved one for an extended period of time, only to discover that they are living on the street or have fatally overdosed. Such shocks can cause a relative to endure severe trauma or develop unhealthy coping mechanisms like codependent behaviors in response.