If you write a long title (H1, H2, H3) in your page, you can get a problem of size in your lateral menu...
I know it's possible to use CSS to hide a part of the title.
I suggest this one to write a title :
My very looooooong title on the page|Short title
The separator between long and short titles is | (or other characters)
I suggest also :
My title|#url my_other_page_where_I_jump