A mum who is battling cancer told of experiencing 'living hell' after being harassed by her son.
Sam Hargreaves, 29, made vile threats to his mother, including saying he'd 'petrol bomb her van'.
She said she is afraid of Hargreaves, and that his behaviour has brought particular strain due to her cancer diagnosis.
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He was previously prosecuted after telling her: "One of the reasons you got cancer is karma for disowning your son."
His mental health problems were exacerbated by the coronavirus lockdown, his barrister said.
Problems had arisen in Hargreaves' relationship with his mother after she had another child, Manchester Crown Court heard.
Hargreaves, from Longsight, was jailed for 14 months.
He made about 30 calls from a withheld number to his mother, over a two to three hour period on February 1.
He became 'increasingly angry' and over the next few days she received further calls.
On one occasion he left a voicemail and made threats, saying he'd 'bite her face off' and 'petrol bomb her van'.
She said she is 'fearful' of her son and 'constantly on edge'.
She described experiencing a 'living hell', and has installed CCTV and a letter box lock at her home, prosecutor Verity Quaite said.
There was already a restraining order in place against Hargreaves to protect his mother.
He previously received a suspended sentence for breaching the order, after leaving a voicemail and saying: "One of the reasons you got cancer is karma for disowning your son."
Hargreaves was also prosecuted previously after making 'serious threats' to his cousins, saying he'd 'petrol bomb their homes'.
There has already been an indefinite restraining order made against Hargreaves in respect of his stepfather.
A indefinite restraining order has also now been passed preventing him from contacting his mother.
Defending, Thomas McKail said the threats made were 'hollow' at a 'low point' in Hargreaves' life.
He was concerned about potentially being evicted from his home and the lockdown affected his access to mental health services, the court heard.
Hargreaves suffers from mixed personality disorder and has had mental health problems since childhood, Mr McKail said.
There were problems in the relationship with his mother after she had another child, the barrister said.
"Issues with abandonment are clearly still resonant with this young man," Mr McKail said.
Hargreaves, of Hamilton Road, Longsight, pleaded guilty to breaching a restraining order, harassment, and breaching a suspended sentence.
"By your conduct, you have caused immense harm to your family members, your stepfather, your cousins, and especially your mother, who is currently, I am sad to discover, battling with serious illness," the judge, Recorder Anthony O'Donohue said.
