It can, yes. Side effects of PTSD can include depression, severe anxiety, difficulty sleeping, nightmares, and flashbacks, among others. All of these have the possibility of being severe enough that a person’s daily routine is interrupted. PTSD is something that can affect anyone because stress is the uniting factor. Some people may experience no, or only mild symptoms while others will suffer from drastic side effects. It’s also important to remember the effects of PTSD can begin showing within hours of witnessing/experiencing a traumatic event or develop months afterward. There is really no “standard” experience when it comes to PTSD because the side effects and treatment/healing are all influenced by personal experience and, to some extent, individual biology.