There are also physical sensations in response to grief:

"When we are stressed, our nervous system automatically produces chemicals, One is called adrenaline. The release of this chemical and others in our body cuases the feeling of breathlessness with frequent sighing. Other sensations include tightness in the chest, increased heart rate, palpitations, cold clammy hands, dry mouth and headaches.

As the stress continues, our bodies try to adapt by releasing even more chemicals. The release of these chemicals helps explain a rise in blood pressure, shortness of breath, feelings of dizziness, a change in appetite, nausea and feelings of anxiousness or excitability.

Other symptoms including fatigue, lack of energy and lack of motiviation can also be biochemically based. There are also changes in our immune system which leave us more susceptible to infections or disease.

These symptoms are all based on the fact that the body is trying to react and respond to a painful situation. We can do things to try and help our body, but to try to stop the reaction would be like eating a sandwich and telling your stomach not to digest it." 

In addition there are thought pattern disturbances including the inability to concentrate, forgetfullness, inability to manage time and a preoccupation with the loss.

Behavioral changes might include sleep disturbance, sleeping all the time, need for social contact or need to withdraw, need to be held and hugged or need to be left alone, gathering pictures and memorabilia or locking them all away out of sight. These behaviors are individual and are neither right or wrong.