Hi, doctor

As I am not good in English but I do my best to make, my question clear and I would be very grateful to answer my question.

My husband is a fit man and eating a healthy food non-smoker but six days ago, he felt pain in his chest and felt tired and does not like to eat.
I did my best to take him to the hospital but he refused.
He is living in Sweden so he decides to treat him self-there. He went to the hospital there but they did not tell him what the problem is,
They are going to send him to other hospital.
I am very worried about him can please tell me is that a sign of heart problem or cancer or other diseases. I am looking for words to hear form you

Thank you
Amal