Marcia's representative Helen Slan said: "He is currently under treatment and is responding very well."
The couple - who have twin 23-month-old daughters, Eden and Savannah - have not released any further details about 50-year-old Tom's condition.
Marcia recently credited her success and happiness to her husband.
She said: "I think that beauty comes from being happy and connected to the people we love. And his love makes me feel beautiful."
The 46-year-old actress also revealed that motherhood has given her a fresh outlook on life.
She said: "I'm deliriously happy. I mean, I'm scarily happy. Oh my goodness, I mean life is so precious so I just value every day and every gift.
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