What will happen if a person is grief-stricken for a very long period?

What type of physical problems can an aged person suffer if he/she is grief-stricken for a long period? Will heart problems/stroke become likely? How can such persons be brought to normal mental state?

s mental disturbances can affect the health status drastically grief can trigger high blood pressure n cause us to hyper ventilate which may result in a cardiac arrest or stroke..best way to relieve stress s to meditate n take things ina lighter vein after all no one is a loser or winner in the end..

There is much that can happen to a prolonged grief stricken person. This is especially true for some who is an elder.
Grief induces a stress reaction in the body. Prolonged stress is not good for anyone. In addition, such a person (elderly or not) becomes depressed due to the prolonged grief.
Grief can be dysfunctional if too prolonged. This is an impaired grief response.
Grief is something that someone does not "just get over." There are definite stages to grief but anyone can get "stuck" in a given stage, not moving beyond. Stress due to dysfunctional grieving impacts the whole body.
In turn, anything affecting the body impacts the mind and vice versa. Certainly stress (whatever the source), can impact the heart impairing cardiac function.
If the stress is great, then blood pressure can become elevated. Elderly people often already have physical problems. Stress can exacerbate these, causing further physical problems.
By the way, it is possible for someone to die from a broken heart. Grief counseling is common and available for those who need it. In addition, an antidepressant can often be helpful in someone overcoming feelings of depression related to grief.
While this is a simplistic answer I hope it helps.

such person needs change of place and an expert advice and care.

Hi there !
People with grief for longer period will go for dehydration and weight loss due to lesser intake of food and water . This subsequently will lead to more associated problems like weakness, cramps, inability to walk , acid-base imbalance, mental changes etc etc......
After some period of grief, anybody will have to come back to the normal life, as we have to live our life for the sake of the dependants and other members of the family. If we find that some are "mentally so down" with grief, we have to bring them back to normal life by keeping them engaged in something or the other, by giving them "no chance" to go on worrying / thinking about the loss the family has suffered.
After all , that's "the natures rule" and nobody can avoid it......that fact we should remember......agree ?
best wishes !