Many children with ADHD also have other issues. This is called comorbidity. It may mean that they suffer from ADHD and depression, or ADHD and anxiety.
Understanding that your child may be suffering from more than one issue is helpful as your doctor or therapist may recommend treatment for those issues. You may feel that taking time to treat another issue means your child may not be getting the ADHD help they need.
When a doctor or therapist sees a client, they look at all the issues and will make recommendations on the issue they think need to be addressed first. The recommendation to deal with another issue first does not mean that help for ADHD is being put on the shelf. By focusing on the issue that is causing the most difficulty in everyday life and creating change in that area, you’ll notice that an improvement in all behavior. 
It’s always important to make sure you and your therapist/doctor are on the same page with treatment and why that treatment is recommended. It’s not helpful if a therapist or doctor isn’t keeping parents informed of what they are working on. Or if a parent isn’t open about what is happening at home.
Because ADHD and depression occur together frequently, it’s important to know what depression in children looks like as symptoms of depression may manifest differently in children than in adults. When a child is unable to function in school or at home, it can lead to feelings of depression and self-esteem issues. Having depression awareness will allow parents to take a look at their actions and if they are making the situation worse. 
Parents have options when dealing with ADHD and depression. The behavior skills on Smarter Parenting are one facet of help available to parents.
For additional information about ADHD and depression or full show notes, visit: https://www.smarterparenting.com/adhd-parenting-podcast/