Hi,
You worte:

On further questioning it is found that the person was putting on weight all
of sudden since the past 3 to 4 months.

Does anyone have any idea for this sudden change? I am interested in :
under what conditions does a person start putting on weight. Is it related
to kidneys malfunctioning, liver issues or heart issues."

In all such cases, we need to find out if his appetite suddenly became
ravenous, in which case the cause could be Insulinoma or Frohlich's
Syndrome. If not the cause could be Cushing's syndrome or Lipodystrophy or
Hypogonadism or Klinefelter's Syndrome or Hypothyroidism. If associated with
mental retardation it could be Alzhiemer or memory loss occasioned by
various traumatic factors. If your pt is a female you may also investigate
if it is a case of Polycystic ovaries.

Homeopathically the miasm involved is Sycotic (+ Psora of course). At the
recent seminar
Dr. Vijayakar however classified it as Syphilitic if the obesity is one of
exponential/ excessively rapid/galloping/ runaway type,- hence out of
control - running back into psora (active, not latent) - cases of such a
compounded miasm require altogether a different approach because it is like
fire added to the fuel and he dwelled on this topic at length. It is
difficult for me to reproduce it here.

With best wishes,
V.T.Yekkirala