Not exactly, memory pressure represents how much memory your VM want compared to allocated value. As long as this number stays under 100, you have enough available memory to service all virtual machines.
Here is a blog post from Microsoft for more info about memory pressure > http://blogs.technet.com/b/chrisavis/ar ... emory.aspx
Memory pressure can only occur when using dynamic memory, so it is expected to see these alerts triggered.
Let me know if that helps!