We are seniors and my husband fell in the shower. We installed a walk in shower. Can I deduct the cost of the shower?

The shower installation would be a home improvement.  The cost of the improvement is added to the basis of the home when it is sold, it is not deductible on a tax return.

It depends. The expense for a walk-in shower so that your husband could complete activities of daily living does qualify as a medical expense. But, since this is a capital improvement, any increase in the value of the property would need to be deducted from the cost of the walk-in shower.

You must itemize your deductions to claim medical expenses. Also, medical expenses are only deductible for the amount in excess of 7.5% of your AGI. ‌For example, if your AGI is $50,000, only your medical expenses over $3,750 can be claimed as an itemized deduction.‌ 

Refer to IRS Publication 502 for more information.