to say that a symptom is psychosomatic (or has a psychosomatic component) is just to say that it has a psychological aspect to it.

the experience of pain are well known as having a significant psychosomatic component to it. hence... it is unsurprising that different alters have different pain thresholds.

the experience of allergies are well known as having a significant psychosomatic component to them. hence... it is unsurprising that different alters have different allergies.

if someone grew a third head with the emergence of an alter that would be pretty gosh darned amazing.

doesn't happen though.

some alters claim to be dogs or other species like that. if they took a DNA sample and found that the person actually had changed into a member of a different species then that would be pretty gosh darned amazing.

doesn't happen though.

to say something is psychosomatic (or has a psychosomatic aspect) is NOT to say that the person is making it up or to say that they have volountary control over it.

people who feel low are at increased risk of infection. so infection seems to have a psychosomatic component too. does that mean that infections aren't real? of course not.