牛津高阶英汉双解词典
suffer
/ ?s?f?(r); ˋs?f?/ v
[I, Ipr] ~ (from/with/for sth) feel pain, discomfort, great sorrow, etc 感到疼痛、 不适、 悲伤等; 受苦; 吃苦头: Do you suffer from (ie often have) headaches? 你常头痛吗? * She's suffering from loss of memory. 她患有遗忘症. * He suffers terribly with (ie is pained by) his feet. 他的脚痛得不得了. * He made a rash decision now he's suffering for it. 他做决定太仓促--现在可吃到苦头了. * Think how much the parents of the kidnapped boy must have suffered. 那个男孩儿给拐走了, 想想看他父母得多伤心哪.
[Tn] experience or undergo (sth unpleasant) 经历或遭受（不愉快之事）: suffer pain, torture, defeat 遭受痛苦、 折磨、 失败 * We suffered huge losses in the financial crisis. 我们在金融危机中损失惨重.
[I] become worse; lose quality 变坏; 变差; 变糟: Your studies will suffer if you play too much football. 你要是总踢足球, 功课就糟了. * Her business suffered (eg made less profit) when she was ill. 她患病时, 生意受到了影响.
[Tn] (fml 文) tolerate (sth); stand 忍受, 容忍（某事物）; 经得起: How can you suffer such insolence? 你怎能忍受这样的侮辱呢?
(idm 习语) not/never suffer `fools gladly not be patient with people whom one considers to be foolish 对自己认为很笨的人缺乏耐心: an arrogant, impatient woman who doesn't suffer fools gladly 不愿与笨人为伍的高傲而无耐性的女子.
可见，suffer后面直接是痛苦的东西，如losses,insolence;而suffer from是从事件中感到痛苦，如accident之类